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Fenriq: Just because you're doing MAC filtering doesn't mean people can't get on your wireless network. It just means they have to make an effort. (The least you could do for those people kind enough to make an effort is the mess with their heads)
There's been emerging reports that the RIAA has been dropping cases outright if you emphasize the fact that an IP address doesn't automatically translate to a person, and that running an open (or segmented and accessible) WiFi node is a way to enhance this defense.
In the past I've run segmented WiFi networks. It's pretty easy to do on most modern access points, and handy and safer, too. If someone you don't know is hooked up and leeching too much bandwidth it just makes it easier to lock that segment down temporarily, shape the traffic - or do pranks like this.