How do I secure my network? Let me count the ways:
SSID off.
MAC enabled.
Seperate routed subnet.
NIDS.
RADIUS.
Antennae focused to limit distance.
Guard dogs on patrol of the perimeter fences.
Pychopathic guards with stong homicial tendencies, armed with sniper rifles.
OK, OK, the last one is a bit exaggerated.
My question to you is this: If you have any confidentional data, why would you consider placing an open connection to your network?
Secondly, why would you share the connection in the first place? What are you gaining? Profit? A way to meet chicks? A warm fuzzy felling? I've heard the "free beer" arguments, but truth be told, I'm suspicious of altruistic behavior. For an example right here in our little corner of the net, look here:
http://forums.netstumbler.com/showthread.php?s=&threadid=5339