Gree,
Bring it!!! Give us some value back out of all the old epics that are now outdated and are taking up space in our inventory! I would hate to quit this game with a bunch of pixels that I will waste away to nothingness. This will give a great opportunity for a richer feel to the community, you can even set a minimum gem price for certain epics and start to tier them! Don't be fools and think there is nothing in it for you, there is always a way!
Haters please refrain from defending gree and pointing out to me that I shouldn't spend money on the game, thanks!