I think what jacobolus is saying is after a certain point, more money won't necessarily lead to better quality of work.
edit: More to the point, I think this idea that people don't work for money is one pushed by management at the expense of the workers, and when I hear employers putting that out there, I assume those employers are... bad to work for, because they think that by being manipulative, they can get you to work for less.
Usually, those employers have less pleasant cultures and pay less than employers who simply pay more than their competition.
I don’t employ anyone, so you don’t need to worry about whether I would hire you to keep doing your hobby and kill your love for it.