eBay is so full of garbage I don't understand how they have $10bn of revenue. Yes, that's billions. But then maybe there is a huge garbage market opportunity out there.
They're a pretty reliable source for used electronics. I go to them every time my favorite out-of-production camera breaks and I want to get another of the same model.
The reality is that eBay is full of great electronics and car parts, and sell shitloads of both. Also most things on amazon that are just drop shipped alibaba stuff can be found on eBay for cheaper and less marketing bullshit.