if you look at the what stuff listed for vs sold for on reverb you see how it goes. The new product retailers prices might drop a dollar or two, but used gear drops like crazy pretty often.
It's a matter of how eager you are to move it and market saturation that really determine what you get for your gear.
Usually when I list anything for sale I go searching for what things have actually sold for, list mine 10% above that (or what I want to get for it, sometimes it's less than the going rate) and eventually drop it. I never list anything for exactly what I want for it, because I will get a lowball offer every single time. Generally when I start selling something I have a list of the prices I'm going to start at, the price I'd like to get and the bottom price I'd take. With Reverb I have to consider the fees, theirs and PayPal. I used to figure in the price of shipping and always show the shipping price as FREE, but then I realized they take more fees out that way and stopped doing that.