I was looking at this article here...
http://www.pcgamer.com/2012/03/21/gu...everyone-wins/
Apparently you can buy gems with real cash, trade them to other players in game for gold, and then use that gold to buy gear, mats, whatever you want.
So someone can basically spend cash and buy all the best stuff in the game with the gold they get from selling gems.
Wouldn't it make more sense for the gems to be bop, and only usable for mounts and other things that don't break the game?