Show Your Work by Austin Kleon is a great book I just finished. Here’s a quote I picked out of it about the concept of selling out (am I allowed to do that? ah, what the heck! I’ll risk it):
Be ambitious. Keep yourself busy. Think bigger. Expand your audience. Don’t hobble yourself in the name of “keeping it real,” or “not selling out.” Try new things. If an opportunity comes along that will allow you to do more of the kind of work you want to do, say Yes. If an opportunity comes along that would mean more money, but less of the kind of work you want to do, say No.
Pretty rad, huh?