giving out your IP address over the internet can be very dangerous.
My current IP address is 210.9.241.113. It will most likely not change for a while, because my internet connection is semi-permanent. Nyah. =P
Seriously, it's not that dangerous, especially if you're behind a NAT firewall like I am. Did you know that you give out your IP address every time you send any information over the internet? Including when you host a game, join a game, or even view a webpage. It's not exactly private information!
Having hub servers that are run by users will be quite hard. You would have to go through all the trouble of typing in the IP address, and the port, and so on; also, giving out your IP address over the internet can be very dangerous.
On a more off-topic point:
Did Lummox make any, and I state this clearly, any, reference to ideas similar to Nazi ideas? Did he post anything anti-semitic? Did he say "Kill all the gypsies!"?
No.
Have you any reason to accuse him of being a Neo-Nazi or a Nazi sympathizer?
No.