I wonder how much the fees charged by Ebay, Reverb, etc have contributed to the prices of used gear. You have a guitar that is worth $1500. Reverb puts about 8% on it, if you use Paypal, there's another 3.5%. Someone is now asking $1670 just to break even. Then you pay 5-7% sales tax on it, and that 1500 guitar is now costing somebody about $250 more than it's worth. You decide to flip it, since you don't "bond" with it, so the cycle begins again. By now, that $1500 gets listed for about $2K, just to cover the fees you've spent and are going to spend. Two flips, and the guitar costs more than a new one. Nobody is will to take a loss on used equipment these days. The next guy sees that the same guitar just got listed for $2K, so he lists his for $2100.
I remember reading classified ads in the newspaper. It cost about $2 for 3 day listing. That's how I found my Jaguar back in the late 60s. It cost $200 used vs a new one being $300+.
I blame Reverb and Paypal for inflation! Maybe we can get congress to look into this!