Originally Posted by
gfunkdave
I solve this problem by leaving my wifi open, and closing all ports on my machines.
If someone wants a little bandwidth for a bit, I don't mind.
Plus, if someone traces questionable activity to my IP, I can say that it could easily have been someone else.

That's a stunningly dangerous decision - speaking as a professional in the networking / communications industry. There's whole categories of "questionable activity" where the relevant authorities wouldn't even stop to listen to a defense like that (eg: the FBI "believing" that anything "terrorism-related" originated from that connection, to say the least); personally I'd be doing everything I could to keep people from getting to that stage.
Besides, how do you possibly benefit from that setup?