Many geeks have access to high places. They don't have to own them or own them outright. Also, many average people could be trivially sold on contributing to interconnecting for shared benefits: fast, cheap internet, vast amounts of locally cached media, LAN games, and access to redundant connectivity. The way things are going with mobile ad-hoc networking, though, a lot of these human-speed agreements will become less of a requirement. Maybe a friend allowing you in to a trust network and the provision of connectivity or other resources will likely suffice for automated acceptance. (Yeah, spam, freeload, etc. But these are ~solveable by proxy-penalizing whoever lets such nodes in.) Some such communities might also want to run shared surveillance of their geographic perimiters (or local wildlife!).