Follow these rules to avoid a world-wide exposure of your private computers through wi-fi exploits. You never know when a frendly-looking, intelligent, and un-suspicious looking guy is cracking into your home network while sitting in his car 30 meters down the road.

They wouldn't find anything interesting on mine. I've heard to many horror stories. All my banking and billpaying are done at the bank, my computer is just for my own enjoyment.

That's a good security policy.

However it is not always about finding out stuff on your own pc. Sometimes an attacker could use your pc as an intermediate hop or even a starting point of an attack.