Sometimes, you'll end up in a situation where the money does not matter and that work may not teach you something - and it may solely make money for the company

Sometimes, you'll end up in a situation where the money does not matter and that work may not teach you something - and it may solely make money for the company. At that point, you may as well refuse to do that work. Because if you take it, you'll do it without any interest. And it will suck.