i thought it would be cool if you could loot a tc after say.... 50,000 non grey battles... I know tc's are only for $$ purchases.. but this is my logic...
anyone who does 50,000+ battles is spending money on the game anyways...so it would be a nice "OMFG!!" YAY.. moment and would keep people spending money and grinding away with encouragement...a little thank you for spending money and playing
maybe stupid but i think it would be a great moment when you see that loot screen and your heart skips a beat :P