Details of the contract can be found in eBay's post.
Base price is 0.99Eur.
http://cgi.ebay.it/ws/eBayISAPI.dll?ViewItem&item=121363179174
Wait - so you're selling 0.1 BTC for only 0.99 euro? IMO the auction won't go anywhere near the current price of bitcoin, so you're basically just making a loss... or are you planning to run away with 1 dollar?
0.99 euro is the starting price and should no additional bidder show up then yes, 100mBTC will go for that price. No catch nor scam.
I do expect some more bidding but if that doesn't happen I will certainly not run away with my fortune of 0.99 Euros!
This is a legit experiment in applied crypto finance so feel free to bid.