Yeah, I wouldn't buy from some of those sellers (where you can't see their feedback and the item is in China) although some of those listings look to be real and for good prices from reputable eBay sellers with good number of positive feedback.
I've been looking at buying a digital camcorder on eBay over the last week or so and the number of obvious scams from sellers is ridiculous. I've reported a bunch of them to eBay and had them removed but they'll probably just try again.
What I was seeing was usually a seller with 10 or so feebacks w/ all positive, but then when you check the dates and times on the feedback they were all within a few minutes of each other and clicking on the item that was "sold" was just a link to a junk listing. Sadly, while doing a search for completed listings to get an idea of the price that items I was looking at were going for, I saw some of those bogus listings being won. Someone's in for a rude surprise.
A couple times it looked like someone's account got hacked too but wasn't sure of those. Usually, if they said to contact them with questions at some alternate e-mail address I'd pass on by. In some of those instances, the seller hadn't been active in a year and the item they were selling was nothing like what was on auction now.
The rule with eBay is that if a price is too good to be true, it usually isn't...