The amount of time it takes to earn even the smallest amount is ridiculous and a lot of the top games for earning require a lot of money put into them to net any sort of real progress that counts towards MistPlay rewards... And you end up spending more to earn a small reward that isn't worth the value. It also doesn't track rewards too well, and once you reach a certain point in some games, it's near impossible to make progress with earning MistPlay points/credit.