My ex girlfriend used to scam people on ebay with auctions like that. She'd actually deliever like 25% of them.
For some reason had impeccable feedback, most sellers wont leave feedback until you've left positive feedback. I personally would reccomend dealing with the fine people here on MR Markeyplace and nowhere else... but that's just me.
I bought my 2.2 ghz SR MBP off eBay a few months ago new sealed in box, and it is perfect and just as described (actually sealed)...and I got it at a HUGE price discount (over $450 off new). Seller did have 3000+ feedback though too.