Then collect locations of those wanting to use it so you know what cities to roll out to next.
Also, C&P looks too convoluted; it's trying to fuse too many different things simultaneously which have been very problematic even when given greater focus.
The game elements are possibly a good idea depending on what sort of community you want, but they need to be refined significantly.
Something like this has effectiveness which goes as a function of the number of active nodes. It's much easier to increase that locally. Scaling by adding other areas after you've knocked a few corners off and gotten a reasonably active network going is relatively straightforwards compared to trying to eat the whole pie at once.
Facebook and Craigslist both did this very successfully.
Limiting it to one city or region would be a mistake, in my opinion. This isn't a local story, any more than Mechanical Turks or oDesk is.