I am happy to pass judgement on thecarpathian for no reason, I am happy to even just make one up!
The bids on old Yamaha, Denon and Marantz, Pioneer, Onkyo, Technics, Adcom amps and receivers are going through the roof on shopgoodwill - meaning well above ebay prices. 2-800 bucks. Sansui and Nakamichi are another category, they sell for way higher.
Which makes me think they are not reselling them, necessarily. I think they are worth those bids but they are no longer great deals.
There are a fair amount of newer gear, Peach Audio, NAD, Rotel, Emotiva that sell for less than their ebay values.
Not sure if it's a trend. But e.g. a decent Denon receiver for 300 bucks is fun toy, will drive any speaker and easy entry into hifi.
I am absolutely disturbed by all the youtube videos of warehouses full of vintage hifi gear. They should be used and enjoyed by would-be audiophiles.