Create a proxy that can't be blocked, and well you have yourself a goldmine. I have accomplished this feat to some degree. =]
Sounds like you've simply found a way to shuffle the IP. There are programs out there that do it now. Their name's escape me since I do not need proxies anymore, but they've been around for years.
Bare, Web(non)sense can ban domains, not just the IP. And if I used IP w/ no domain how would people know how to access the proxy?