IMHO an advertising model is financially viable--it's just more risky for small players. In a subscription model, your users are right in front you; in an advertising model, you have to go out and get them.
That may require deep pockets--like Google's. Rob [http://dailywireless.org/modules.php?name=News&file=article&sid=5519 ] -- NYCwireless - http://www.nycwireless.net/ Un/Subscribe: http://lists.nycwireless.net/mailman/listinfo/nycwireless/ Archives: http://lists.nycwireless.net/pipermail/nycwireless/