I got hacked once...someone made about $300 worth of listing fees...only found out because I actually got an email about someone asking about one of the items. Luckily because it was caught quickly, everything got removed and resolved...(ended up taking around 2 hours of my time on a Sunday afternoon for all this). I get phishing emails a lot; the latest now makes it look like I haven't paid for an item I "won" yet...