Add a button to the rewards in the inventory, to let the users sell the unused rewards for their gem value.
Thats a great idea. Any kind or exchange would be acceptable rather than just wasting the rewards. Even limited time bonuses like wrtie 3 good quality articles and earn additional 100 SGems, get triple boost on mini games for 6 hours. There are many ways they could make it more interesting for the 'G'hag Posse' to get more value out of the rewards
My inventory has been piled up with useless CD keys that I haven't used, I've been asking them to do something like this for the last couple of months so that we can either seel rewards that we don't want and not used or clean out our inventory. But nothing has been done about any of it.