Wireless network are useful for the bad guy only to dissimulate the source of the attack... Or steal some bandwidth... Is more like a tool, not an exploit...

The basic way to protect a wireless network (WEP, MAC filtering, etc) is only good enough to get rid of the pass-by hackers. Lot of business get a wireless network because is cheap... But forget to protect it or don't want to pay for it... because is very expensive to do so...