It depends who the wireless is through. I know through our internet provider, if someone tries to log in and use our wireless, they get automatically locked out and we get a phone call, but we have a lock on ours anyway.
Alot of people dont know you HAVE to lock it, to get other people off it, so not their fault really. I personally see it as stealing. You wouldnt walk through someone else's door because it isnt locked, so i wouldnt steal their internet that they havent locked it. That of course is just my opinion.
When i first got wireless, i didnt know i had to lock it, and i would always reach my limit 2 weeks before my bill came and couldnt understand why, then i rang the provider and they told me about downloading movies etc which i didnt do! To me it was like i was violated.
I dont care what anyone does, this is just my opinion and my experience.
ThE eLvEs HaVe ReTiReD!!