Because, I don't know if you're noticed, having a paying job is exhausting. The world setup in such a way that for a normal person, getting money means someone will suck every bit of life of you. That's, pardon the not nice metaphor, the difference between night of passionate sex and selling your ass so your pimp doesn't beat you up. Both activities can be reduced to physical aspects, but not a lot of people will ask why one is desirable and the other is less so.