I agree with you.
For those who care about security, they should use WPA2 with a
strong key.
We kinda got off point though. My fault probably. :p
The point I was trying to make is:
If you are worried about people tapping into your wireless network
and using your network resources, you should secure your wireless
networking using the strongest means possible.
Rather than checking all the time who has come through the door,
you should just lock the door and give the key to people who are
authorized to enter.