This isn't the first time we've heard this, but recently PC World has reported that your virtual assets may worth more than your real assets. From the article:
According to Craig Schmugar, a researcher with the McAfee research labs, McAfee now sees more password-stealing malware designed to nab accounts of games like Lineage and World of Warcraft than Trojans that go after financial accounts.
Why? Your in-game assets can easily be converted to cash and there's much less legal risk involved in trafficking virtual goods than trafficking, say, stolen credit card numbers. So treat this as a reminder: be careful of keyloggers! (And if you're not sure how, read up on our advice on how to keep your system keylogger-free.)