Will its very easy for some people to change their ip...
Start >> Run >> Type cmd press enter >> type ipconfig /release >> unplug your modem >> plug it back in >> when it is done connecting you are under a new ip...That only works for users on DSL or Cable internet (maybe more, I have tried on both dsl and cable internet service...)
One thing you all could look into starting is a service simalar to
http://www.domainlagoon.com But make it so the person only has to have 5 points if they want the domain to be on a Zymic host account and 10 points if they want it to be in their name (they control dns and such...) Or you could like require 5 pts. for full control and sell adspace on the site...