I mean... you can still sell these guns for 15k to new players, its not like they actually know how much weapons really are . But anyways, the reason I suggested this is because of a few situations I saw where it was easy to be scammed. There was one were the item lab was disguised as a game and a text screen placed above saying "hit button repeatedly to go flying". There was no way to tell it was an item lab as it was well hidden and it seemed innocent. I saw a player who had been around for a while lose a lot of money to this. Another situation I had seen was where a person would set up an item lab for cheap and switch it to 15k as soon as someone came up to it to buy from it. I didn't suggest this because of the 15k scam but rather because of the other scamming sits that have come out of the item lab that are easily fixed with this update.
Maybe you should suggest a lowering on item labs, it might help your issue be resolved.