I agree with Madpick - it is a little too subjective. I've even had instances where I had something and tried to sell it for around what I had purchased it for and found out that, well, I way overpaid. Pricing an item for sale is tough enough. I always figure if it doesn't sell, I lower the price. At some point, I may just decide to keep it. A seller wants the max, and the buyer wants a deal. The asking price is not always the selling price.
Most of the horrendous posts I have seen have been on ammo, and by new members or members with next to zero post count. They'll be gone soon and it won't be a problem.
Now, a wall for those who helped others in tough times with good deals....that could work