Huh? WoW goods are key elements in a game specifically designed around their acquisition. IP is a tiny part of a completely different game we call the "economy," a game that was designed and refined around a radically different class of goods with essentially no attributes in common.

Trying to apply market-economic rules to IP is like trying to use a Zamboni as a lawnmower. Sure, it can be done, but you're going to have to force people to do it, and they are going to invent some very creative workarounds.

When you have to force people to follow the rules, it often means there's something wrong with the rules.

High-def movies are sold for a profit unlike most WoW goods so they are more like the goods sold in the Maple Story cash shop.