fleaBay is endless entertainment for me. Last night there was a seller that had 5 consecutive listings of fake coins. You've got to be an idiot to buy supposedly rare silver coins for half of melt.
Or lucky. I nabbed a few on eBay over the course of several years. Turned a nice profit on a few of them, but if you factor it out over the time and attention I spent, it's another sub-minimum wage job. But, yeah, when you see a key date raw coin and the listing says "5 available"... nope.
Yep. Every once in a while you find a unicorn, but it's on auction, not "buy it now". I'm still pinching myself for grabbing a raw Morgan that ended up grading PCGS MS67 for about $60 bucks. But that was last year. Glory days! And those times are why I keep looking.
For me, it was usually the other way around - find something that was freshly posted BIN at a lower-than-expected price, and snatch it before anyone else could. I got pretty good at spotting the legit ones, and Buyer Protection had me covered in the cases where I didn't receive what was advertised. But, again, too much time and attention, and the last few times I tried it seemed like the pickings were too sparse to make it worthwhile. (Too many bad listings, too few good ones.)