I was just about to say the same thing. It just seems like creating a thread for a marketplace ad has a 75% chance of going downhill one way or another. I've sold more than a couple of games here without creating any threads. If the game is on a wishlist, then that person used to get an alert to the sale. That way you get attention from people who are actually interested in a pin without the mob scene.
Don't complain about the "price police" if you decide to put up a billboard on the side of the highway.