A question to all the detractors:

Wouldn't you rather have all that real life cash being spent on gil to go towards developing FFXIV:ARR instead of funding organized crime?

I mean, this isn't a hard thing to understand. The market for digital currency is never going away, so it can either be harnessed for the good of the game or by criminals.

Also, Guild Wars 2 does perfectly fine with selling its in game currency on its item store.