I mean, having more options for used parts is not a bad thing.
For me, parts, unless I think they can sell for $300 or more, just go into my spare parts bin, and age there until they are nothing but e-waste. Maybe some day I'll use it, maybe not. With how much effort it is to sell something, and the fees the likes of Paypal and eBay take, it just isn't worth my effort unless I can at least sell something for ~$300.
But I bet the "trade in" values are going to be equally insulting to what Game Stop used to offer.
I will often buy used Enterprise stuff from well rated recyclers on eBay, but knowing as much as I do about the state of education and care among consumers/gamers I just don't buy used consumer parts.
Once years ago when I had greater faith in humanity, I bought a used GeForce GTX 460 (768MB version). I didn't care. It was cheap, and I needed something to hold me over, as my current GPU had had an accident.
The GPU with no other packing material arrived in a plastic shopping bag inside a box. No other packaging, no other padding. Shockingly it actually worked, and held me over for a month or so until I bought my GeForce GTX 680 at launch.
But you never know what these parts have gone through. Physical damage is at least visible. ESD is usually invisible. The part could have ESD damage to the point where it is still working right now, but is a ticking time bomb (this is very common, in fact most ESD doesn't kill stuff, it just degrades it but increases its risk of failing later by orders of magnitude.
Add in people re-pasting and damaging things under the cooler, volt mods, you name it. Nope, I will never buy a used consumer part.
Enterprise parts - however - are great. I'm often buying decommed server NIC's, HBA's and CPU's.
I just found a good deal on two Intel XL710-QDA2 dual QSFP+ port 40 gig NIC's. These will be an excellent secondary direct link to the NAS.
(I guess I am now committed to not being able to upgrade the Threadripper motehrboard until I can find something with 16x-8x capability at the same time

)