Last month we bought a piece of equipment off eBay. It had 1/2 a dozen photos or so, the transaction went smooth, we paid, got the items, no issues at all. Last week, when I searched under the name of the machine, I saw a listing for the same machine. Same photos, same description, everything, except it was a different user and it had some note at the bottom, which was a JPEG, saying you needed to email him before bidding. I sent the seller a message, and reported it to eBay as fraudulent. The selling sent me a message back, telling me they didn't list it and didn't know how it got there. The seller had a 100% positive rating with over 500 sales, so I'm guessing he was telling the truth.
This morning, I searched again, found the same thing, different seller, different part of the country. All our machines photos are all there, same descriptions, everything. Again, I sent the seller a message, then contacted eBay about it being a fraud. The seller sent me a message back, thanking me, telling me that there are now 3 things listed under his account that he didn't list, and that he doesn't visit eBay very often so he wouldn't have even known had I not sent him a message.
I'm not sure how they are compromising accounts, but if you have an eBay account, you might want to check it from time to time.
I'm not a big eBay user either, but it's worth paying attention to even if you aren't a steady user.