As someone with Series 6, 7, and 63 investment licenses, I would consider "investing" in a "Virtual World's Company" to be downright ridiculous. This isn't being said in any bias whatsoever, as I've been playing pay-to-play online games since the original Neverwinter Nights in the early 90s before 99.99% of people who are currently obsessed with online games ever heard of them.
That being said, online games that actually do become successful are rarely profitable for over a few years, and follow-up success is often even rarer. Investing capital in a company that will have major stock fluctuations, usually on the bear side, in a few years time is a horrid strategy. Would have a hard time explaining suitability if you were investing on somebody else's behalf as a broker, probably to the extent of fines.
But then again, there is a sucker born every minute, look at the dot.com bubble burst.