When you are playing a game that is based around rare and special items, you cannot complain that there are rare and special items.
If GameGold wasn't in game, just like happened on Euro Mir people would be buying GoldBars on ebay for £20. That had nothing to do with the developers, that was a price decided by want and desire.
The fact that you can trade GameGold (which you cannot on most other games) is specifically making everything achievable for everyone. You can freely earn Gold and trade it for GameGold at values decided by the players and spend that GameGold in the shop or trade it again, by giving it to another player, for an item you want.
Allowing trades outside of the game is ripe for abuse. It breeds theft, greed and grief and prevents us from protecting the majority of players who simply just want to play.
We are not a casino and you cannot cash out your chips.