I recently had a bout with a Nigerian bidder on there, they claimed they were buying an item that was set as "buy it now" for their nephew, but then when the sellers details didn't match I knew something was up.
They tried to get their disputes filed almost the same day they bid, and sent in two payments from seperate addresses.
Paypal and eBay both ended up charging me to relist the item, and put $600 of my checking account money on "hold" because of the scammers requests to credit them back.
Nothing was taken from the account, but it delayed the availability of my funds for about a week and a half while they "investigated"
And seriously, there isn't much you can do to actually talk to someone.
eBay sucks now.