My boyfriend is an Sp/Sx, and I know that he often will sacrifice his time and comfort because he cares about people in general and their wellbeing, not because it will make things easier for him. He is a comfort seeker and protective of his resources, but in the long run, I think it evens out, as Sps naturally have more resources to give because
they are more careful about allocation. Being Sx/So, I'm probably more willing to just jump into external things, but I also generally have less resources to do so.
Interestingly, if given preference, I think that what he tends to do is include those important to him in his resource allocation - in other words, he will try to ensure comfort for everyone by sacrificing resources up front, so that he can work around it, rather than having to sacrifice it down the line when it's harder to shift things around.