You don’t really do it for money, or you’re a monkey. You don’t think of the bottom line, or you’re a monkey. You don’t think of it in terms of hourly wage, yearly wage, even lifetime wage, or you’re a monkey. In the end, you don’t even do it for love, although it would be nice to think so. You do it because not to do it is suicide.
Stephen King, Introduction to Skeleton Crew.
What more do you need, really?