There's a few problems with these situations. Most of the time someone buys an amp or whatever and usually wants to change it within the month. They just paid $500 and now that they're selling after only a month they feel like losing $100+ is too big of a loss. Understandable by the seller but like stated before. Especially with used electronics. Value decreases when used! Also, it depends on the going rate for a product. I recently sold a saz2500. Before putting it up, I searched the forum to see how much were they going for ($500-$550 range) so I put mine at $490 shipped to try to get a quicker sell. There's a lot that factors in the seller's price.