Yes, anet should take an occasional time or two to go on a banning rampage through balth int d.
What's even more alarming is how many people responding to this thread are basically saying "no they shouldn't" for one reason or another. In reality, most of the people IG who have oodles of plat and condemn buying gold online are the same ones who are supporting those companies in 3rd world countries farming like crazy and selling plat/items. Oh, sound off and flame all you want, but in many cases (not all) that is true and I bet most of the people who would jump on my case for saying so are the ones who are doing it. Not all wealthy people IG do this though, and my props to the skill and players who find IG methods with honor to raise their fortunes.
The other part of the difficulty is that A-Net is more concerned about banning the "buyers" who actually play the game and influence the IG economy. They dont' get caught often enough, but they're the ones they do hunt down more then the rest. As far as the sellers are concerned, yup, they just bag the accnt and get another one. In addition, being banned for selling/buying gold doesn't in most cases ban you forever. First, it's like a 2-3 day ban, then a week, then 2-3 weeks or a month - then forever. Basically that's 4 chances on one accnt alone which overall with the system and guidelines they have set up doesn't make it very effective

Tougher issue and problem to address more effectively then it looks actually, but yeah - definitely ridiculous.