I have bought and sold on Ebay for many years. I have experienced a few bad sellers and buyers over the years. Less than 1%. I have always come out ok and have never experienced a loss on Ebay. When Ebay first started Ebay tended to favor sellers in disputes. That policy didn't last long once Ebay realized that buyers were the driving force in their growth and that sellers were a dime a dozen and could be easily replaced.
Your experience differs dramatically from mine. I somewhat recently (last year) bought a window regulator for my pickup. Manual crank window type, nothing fancy. It was ~$25 and listed as OEM Toyota, compared to >$175 from the dealership for the same part.
Received it, not remotely the right part. Not Toyota, also not close to fitting in my truck. Hole spacings were all off by a mile, the physical size and shape were nothing like the part I was replacing. Emailed the seller and asked if maybe there was a mix-up and they shipped the wrong part. They didn't respond, so after a week I left negative feedback and disputed the payment through paypal. Ebay promptly emailed me to tell me the seller had disputed my dispute, and they had ruled in the seller's favor, deleted my negative review, and paypal wouldn't retract my payment. I contested it through my credit card and got my money back after much hassle. I emailed ebay directly to ask for an explanation on the situation and received no response. This seller had 99%+ positive feedback. Must be pretty easy when you're not allowed to get negative feedback.
Edit: Not suggesting you're getting preferential treatment or anything, simply that ebay is blatantly crooked, and don't favor buyers at all in my experience.
Wow, you're absolutely right! They must have had it mis-listed this morning. Dang, I should have bought it.
This happens a surprising amount if you watch Amazon pricing. No idea what causes it. I bought a water pump for the same truck I mention above, OEM Toyota part through Amazon, for $19.85. Showed up and it's the factory original part, in Toyota box with Toyota logo stamped in the casting. Bragging to a friend, I sent the link just after buying and it had gone up to over $130 within minutes of placing my order. My price of $20 stuck and I never heard anything about it. I don't know if it's that they make errors in pricing, or if it's driven intentionally by something else, but if you keep a keen eye, you can catch unreasonably good deals from time to time. In my experience, you pretty much have to pounce to catch it, or it'll go away forever.