After being part of the landscape for so many years, it's difficult to think that people aren't familiar with e(vil)Bay on some level.
The fact is, eBay isn't the place it used to be to buy and sell. The good deals are long gone and it's mostly populated; for photo gear anyway, by dealers. Much the way Auto Trader is mostly populated by dealers now rather than private sellers.
eBay's fee structure is absurd. It's feedback/rating system is a joke. Ratings are completely unreliable because they're so often negotiated (i.e., 'You give me good feedback and I'll give you good feedback'. Or, 'I won't provide feedback till you give me good feedback and then I might give you good feedback'.)
I've used eBay for the odd purchase and sale over the years. When I switched from Canon to Nikon about a year ago, I offloaded most of my Canon gear, my MF gear and my film inventory on eBay. The film did well because I had some pretty rare stuff that's highly sought after. Once all that stuff was gone I bought most of my Nikon gear on eBay as well. Really no difference in price between there and what I could have got from a reputable used dealer like B&H or KEH if they'd had the stuff I wanted. The fees, at the end of it all, were a killer. After all was said and done, I paid in excess of $500 in fees to eBay.
Really wouldn't recommend eBay. It's alright but not the be all and end all.