Not sure if this has been asked, but a philosophical question for Eric: if someone decided to start a padmapper competitor tomorrow, would you be okay with them using your data for free?
I don't see why not. By being a competitor that scrapes PM, they are accepting that there will be a delay in their data versus when it's available on PM. So unless their site was significantly better than PM in some way, in the really competitive apartment hunting markets, they would be strictly inferior to PM.