No one ever got banned for this in WoW, or I would have been the first one to get banned. And your RL example is flawed. People can and do buy things and resell them at a marked up price. It's called Ebay and Craigslist, it's not against the law at all. In fact you do understand that the way consumer rights work once you buy something you have every right to resell it as it is now yours.
The pic in the OP has to be a fake, as I can not see Bioware giving a damn if some one takes the time to game the GTN with the current UI for it. Most people can't even find what they are looking for so I say nice job for someone who can stomach the effort it would take to control even a single area of the market.
EDIT: The only people who ***** about price fixing are those who messed up and bought something at an over-inflated price.