Great post - best since 'your solution is not my problem'... There is room for maybe 2 of these services. People get tired of having to update all over the place. Updating with no compensation is basically a game for the incurably narcissistic. I'm not sure i agree with the customer/business acquisition costs - user generated content + geo data + compiled data / large user base + incentives can solve that for far less. Start paying people or the game gets old. Who wants to play a game without a winner?