The keys are a credit sink and it helps slow down how fast items rise in price because it takes credits out the game. I like them!
Also @Amy I played a tonn of potc yesterday and I never got a chest even once when I lost. And was getting them maybe every 1/3 times I won. I think it might be...
Have you perhaps tried to take the magic off and try wearing it then? Maybe because its on your lanyard and not in the inventory itself its thinking you dont own it..? Just a thought