Craiglist doesn't get traffic from PadMapper. PadMapper gets nearly all of its traffic from Craiglist. Craiglist can charge for mobile licenses because people want the traffic that Craiglist can bring them.
PadMapper gets no traffic from Craigslist. Craiglist gets traffic from PadMapper.
PadMapper is basically a pointer to a listing on Craigslist (when Craigslist listings are the reference), where you can search the pointers with filtering that you can't on Craigslist. In order to get to PadMapper, you have to visit the site directly.
