I stumbled across this search engine:
It uses Google to search, but your first ten searches on any given day are potential prizewinners. About every hour, a random search wins a prize ranging from movie tickets or song downloads all the way up to iPods and PSPs. No one pays to register or anything like that; they just buy the stuff with the ad revenue they bring in. I think it is an ingenious way to generate more users and
a loyalty base. It will be interesting to see if their award structure changes as their user base grows. When there are more users, there is a lower chance of winning. However, that same increase also brings about an increase in funds for more potential prizes. I will be watching to see if the increase the prize rate as the user base increases. Overall, I think it is a good model for the time being. What are your thoughts on this?