Bigger than eBay? Not so sure. If they can keep any negative PR events atBay then they certainly could be a huge success. They certainly will continue growing as more and more people hear about the concept and site. I'm not sure how they'll compete with copycats -- as the model becomes more popular, it will be hard to stay ahead. They'll need a solid loyalty model to keep customers on AirBnB vs shopping HomeAway and their other existing or soon-to-be existing competitors.