It is possible to be involved in something for various reasons, but it does not mean that one should willingly forego a benefit. "In it for the money" implies that the primary motivation is high pay, whereas "not in it for the money" indicates a strong preference for the type of work and a willingness to accept lower pay if market rates were to decrease.

That's awfully convenient lol

Replace programmer with dentist, trading or lawyer, how many work on it by passion ? On evenings unpaid side projects? For guitarists, or artists its not the same (hint: which pays generally more?) , so I would say programmer is a middle ground, from cobol bank programmer to gamedev

I'm not following this comment at all.

> On evenings unpaid side projects?

I'd bet you've got a very skewed view of how people who make their living programming do this outside of learning something to help them get a better job.