Lower the price of the bossmode keys. Normal Key = 400 carats Hard Key = 800 carats Hell Key = 1000 carats They are too expensive considering the fact the rates are not up to par with the pricing. The rates really aren't too good and 1600 for a single key is a bit much. Not only that, Hard Keys should not be the same price as Hell Keys. Also think about the newbies... Nowadays they have to go against a population of (mostly highly experienced players) and extremely OP exos/scrolls. So getting carats isn't so easy for beginner players. Imagine that... 16-20 games on average (without silver british) to rack up just enough for a Hell Key and then you get a 3 day Warlock Hat. Pretty sad life for a newbie! At the very least, make Hard Keys 1200 carats...
