The virtual world of MMOs is proving to be a profitable investment, and even Harvard Business School is taking notice. The Ivy League institution recently held a panel with six of the industry's most influential members to discuss the status quo, and just as important, the future of the virtual realms in gaming as a business market. Check out what they deem to be the biggest barrier to overcome, and for some more analysis on how money culture is making even the virtual world go spinning 'round.