It does if the rewards aren't monetizable because of their ability to break the game. People grind for hats in TF2 all day, and by getting a hat you don't break

It does if the rewards aren't monetizable because of their ability to break the game. People grind for hats in TF2 all day, and by getting a hat you don't break the game. The problem is when you reward people with things that break the game. Don't break the game for profit; simple, no?