Ahh, I see entrepreneur written all over this question ;> . 802.11b is very reliable and, yes, you can run a profitable multi-tenant MAN at 11MBps provided that you have a proper WLAN/LAN/WAN design. You can easily run WiFi with WEP (although I would incorporate a WiFi-tolerant VPN instead) to secure your system. Interference can be managed as long as you properly subnet your network, group users properly by SSID, and limit the maximum number of users to per WAP (max 50). I just designed a system for a friend in NYC that is doing this very thing.
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