Honestly, as annoying as it can be(which isn't very annoying), it's a trading section. If you want the item, and are willing to pay, then get the item. If you're selling an item, and others have competing items, lower your price or whatever to suit your needs.

Depending on how petty you want to get, you could say that players from certain areas of the world are at a disadvantage considering the timezones of which they tend to make selling/buying threads. Certain times are hotspots of activity, and if you dont post then you are disadvantaged. You also would potentially exacerbate and open up people to faking offers to "legally" bump their threads.. Ect ect.

Lastly, is it such a problem that you are trying to enlist the community to police a trading subforum and take time away from the developers day to deal with it? I think you need to take a break from the game if that's logical to you.

Thanks though, i got a good chuckle after thinking about this for a few mins.