Originally Posted by
dalrint
While I'm sure Blizz wanting the gold purchase to go through them is an aspect of this, at the end of the day, it's more about control over the problems that external RMTs cause.
Example A: A guild advertises 100 dollars for a run through to guldan and the mount. Guy signs up, gives them 100 bucks, they kick him from the group and do nothing for him. He complains in trade chat, opens a ticket to blizz because he just got scammed (and scamming is technically against the rules of the game) and blizzard can do nothing about it except 'too bad so sad' because they were external to the actual money process. Can they ban the scammer? Sure. But can they help the guy? Nope.
Example B: A guild advertises 1 million gold for a run to guldan and the mount. Guy signs up, buys some gold from Blizz, gives it to the guild, and they kick him from the group and do nothing for him. Guy complains in trade, opens a ticket to blizzard because he just got scammed. But this time, blizzard can track the gold because it all took place within their servers. They can see the gold purchase, where it changed hands, when the guy got kicked from the group.
IE: In example 2, blizzard can actually help the person that got fucked. In example one, they're as helpless as he is.
Talk all you want about blizzard wanting a cut, but example B is better for everyone except the guy trying to make money off raiding.