I feel like there was a five year span where everyone I talked to said buying or selling electronics on eBay was a nightmare, so I'm a little curious if I need to re-evaluate my priors.
The real issue is being a seller and solving the "and then the customer claims I shipped them a box of rocks" problem.
A 7532 CPU is now ewaste for all the datacenters out there 1/10 of original price is reasonable, but the latest Nvidia GPU for 200 bucks is obviously a scam.
I've personally never had that problem after over a decade and hundreds of purchases on eBay. I've had some defective parts, but never outright fraud. IME eBay favors buyers.