The problem with using WoW tokens as an example is that I firmly believe the prices are set and maintained by Blizzard. all it is, is buying gold direct essentially. The pricing and guaranteed sale time pretty much screams manipulation by them. which is fine, its their game.

Another thing, I dont think the average wage in the US is anywhere close to $20 an hour

I dont see much game value added by allowing gil to be purchased through SE, or by allowing items to be bought then sold for gil. all that tends to do is boost prices, not lower them. boosted prices mean the rmt market bots have easier paths to gil because they buy out and relist at a higher price... slowly driving the price further and further up, which means people need to.. buy gil. it works out to be a rather vicious circle that ends up in no way favouring the general player who just wants to play and buy the odd items.