The answer is, FUCK YEAH.
So I've read that people begin to enjoy and invest more in their jobs once they reach a certain threshold of comfortable living income. That perhaps they liked what they did, but when they were not getting paid much or were broke, they had a lot of doubt, a little motivation.
I know I've experienced this.
Also, anyone that's ever volunteered for a good cause, and has felt like they've really helped people knows it's a good feeling.
And can even turn into a "selfish" addiction, but I'd say it's one that's win win.