I agree with all the above, but I've sold a turntable, amp, preamp and a server and sold them quickly as I put fair prices on them with detailed descriptions. And they were popular brands which also helps.
Although it is annoying how many dealers put their equipment up. But having been in the stereo business long ago, they have to move their trade-ins and not keep their money tied up in old equipment. And of course they use the trade-ins as an opening to sell new equipment.