They will for example study something or do something because it's "useful" or be friends with someone just because the person is "nice".
This is very true.

My main reasons for not hanging out with people would be 1) Meanness/annoying-ness, and 2) Lack of things to talk about, in that order. I just care so much more about character, than anything else, when choosing my friends. (I mean, obviously I care about them being interesting too. But the priorities are in a slightly different order.)
I don't know, difficult question. I'm not really feeling the OP here, sorry, EJCC.
Personally, I definitely have preferences of what bores me and what interests me, it motivates my choices and my activities, though I feel that there's something more to your question. Will have to think more on it. I do like to find something interesting in my day outside of work, and yet, in the past few years, I've seen that even when I want to engage in an interest/hobby, I don't feel spurred into doing it until my "comfort needs" have been indulged and exhausted.

That could be caused by something else entirely, though.
Regarding the bolded: Yeah, I understand that. I wondered when I wrote the OP if my definition of "boredom" is different -- or if I just never let myself become bored? I find that my motivation, when it comes to my activities, isn't as much interest vs. boredom as interest vs. disinterest... And when I'm bored by something, it's usually because 1) I don't care about it, 2) I think it's pointless, and/or 3) it uses a lot of technical language that I don't understand. Even the densest book is interesting if I really care about the subject material.
Regarding the second-to-last sentence: Could you elaborate? What do you mean by "comfort needs"?
I'd say each type may classify boredom differently, even among the same temperaments. SFJs might like drama and find it exciting, STJs may think it's tedious, etc. Also, I'd say SPs are the type most attuned to avoiding "boredom" in the sense it's typically used.
SPs more than NTs?

Maybe it's from me not having many SP friends... or me having an INTP 5w4 dad who's always on the lookout for new things, and an INTJ roommate who complains about boredom more than anything else in the world...
For SJs, I wouldn't say they're attracted to boring things, but they're attracted to familiar things, and to echo
MDP2525 they seem immune to becoming bored while doing "the things that must be done." Honestly it seems like a super power to me.

umpyouup:
I think you're onto something here in the sense that utility is a more powerful preoccupation with SJs than boredom. So while an NP might shy away from something or someone because they're no longer interesting, an SJ would do so because it isn't getting them anywhere ... maybe?
Yes!

That is exactly it. If a task is the most tedious and horrible thing, but I have to do it in order to get an A in my class, then I'll do it in a very intense and focused way, concentrating on the meaning of the thing (i.e. the A grade) instead of concentrating on how much I don't want to do the thing -- because how does my opinion on it matter? It has to get done, for the sake of my grade. Whereas if I definitely had an A, and the tedious thing was for extra credit, I would have zero motivation to do it and I would do something more fun instead.
I suspect I have a sort of combination NF/SJ approach to this.
"Bored" is rarely a problem for me. I know there is always something I should be doing. Or that's interesting that I could be doing. It's often just a case of getting off my rear.
I get tired, sad, angry, lonely, etc...and I procrastinate...but bored? Rarely. Maybe if I'm stuck in a meeting I don't want to be in, something like that. I'm very good at entertaining myself. There is too much going on inside my head to get bored, and if I need something external, there's friends, books, music, dvds, travel or travel plans, etc...
This is my experience with NFs in general, which is why I brought them up in the OP. I could never imagine my NF friends being bored, unless, like you said, they were put into a boring situation that they had to focus their attention on, and couldn't escape. (My ENFJ friend takes 4-hour plane flights alone without bringing anything to do, or reading any in-flight magazines.

I don't know how he does it. I would need to do something -- anything! Usually I over-prepare for plane flights and bring a huge bag of books and knitting and homework

)
I don't think I relate so much to necessarily finding things interesting because they are useful, though. There are some useful things that are pretty dull. Like tax returns.

if something manages to be both useful and interesting, that's fantastic. In a way, if something is interesting to me, it will always be somehow useful. Because it makes me happy, it relaxes me, it stimulates me, etc.
I have a few hobbies like this. But I have to keep reassuring myself -- it's useful because it relaxes you, it's useful because you'd be miserable without a creative outlet.
I have to admit I don't have so much sympathy for people who find other people or situations "boring" on a regular basis. It makes me think that you feel others, and the world, are there just to entertain you. Or that people can be used. Users are often characterized by talking about how bored they get or how boring others are. It makes you seem very childish to me if it's one of your big preoccupations. Childish and lacking creativity and initiative. And very likely selfish.
This is true. I see it a lot, primarily in Thinkers, when they hang out with people they don't know very well. (This includes myself, and I feel bad sometimes about that "using" attitude towards my circle of friendly acquaintances, i.e. I hang out with them because they're entertaining and interesting but not for any deeper reason -- because I don't know them well enough to know who they are separated from what they like.)
-My friends must be nice (ie. good people, kind, etc).
-Ideally they should be both nice and interesting. My closest friends generally fall into that category. "Interesting" isn't a requirement for friendship, though. "Nice" is a pretty much non-negotiable requirement.
-If they are interesting but not nice, it is highly unlikely that I will want them as more than acquaintances, if that. An interesting/nasty person is probably best observed from a distance.
This is my approach, too.

I prefer nice over interesting. Maybe that's why I connect so well with NFs -- shared priorities!
Speaking for myself (maybe or maybe not other SJs)... I'm inclined to believe that we probably derive a high sense of satisfaction from engaging in familiar tasks (i.e. work) because they allow us to show that we are capable and skilled individuals. In the worst case scenario where we dislike the work; one can still derive a sense of self achievement from having the will power of engaging in a task - value in the idea of endurance, hard-work and not giving up. Granted, it all falls apart if we dislike the work and don't feel that it really shows any sense of achievement.
Indeed. I had a summer job that I really didn't like, because the work was tedious and I didn't connect with my coworkers. But I knew 100%, when the job was over and the fall semester began, that I would have loved the job if I had loved the people working there. See, the way I see it, there are three qualifications for job satisfaction:
1) Knowing you're doing something important,
2) Enjoying the work you do, and
3) Enjoying the company of your coworkers (and possibly befriending them outside of work).
Two of those three make for a job you "like", and three make for an awesome job. In my summer job, I only had #1, which is why I hated it.
I know one of the reasons I like psychology is because I see that it has extremely high practical value in the social world, and it's just also interesting for me personally to learn how to navigate my environment. In the same manner, I can identify with the feeling that I'd enjoy learning something that is deemed 'useful' because it'll just add to my list of personal achievement and skills. When it comes to gaming for example, I'm constantly looking up methods in how to fine-tune my game-play, and this pretty much applies to all aspects of my life. I know there are others who dislike this method because it removes the excitement from discovering things by accident.

I relate to all of this.
I do care a fair amount about the idea of doing 'interesting/meaningful work' as opposed to 'boring/pointless' work.
I'm glad you put the bolded words together like that! It means I'm not the only SJ who associates one with the other. Hooray for validation
Thanks for the input everyone!

Keep it coming!