I haven't read all 30 pages of this thread, but I think the main sentiment of the posts is that Bishop & developers are kindly requested to reconsider the implemented mode of cheat-protection. As most of the previous posters, I am in favor of good anti-cheat measures.
I started playing Utopia (@Jolt) in the late 90s when I was at University. I was introduced to the game by a couple of fellow students, and quickly we decided to try to get into the same kingdom. This is when all the trouble started; Mehul noticed the multiple logins from the same IP address due to the fact that we were using our University internet rooms to play. We've had so many arguments and in the end we convinced Mehul to "whitelist" us.

It seems that 14 years later we're having the same discussions/problems again. People who have been playing the game for ages are now being punished because a couple of idiots from GodKnowsWhere break the rules. Was the whitelist really such a burden? How often did you get a request to have a certain IP address whitelisted? And sure, you would have to do some checking to ensure that the whitelist request would be legit, but there are many ways to confirm if there are actually two or more people on the other side. Perhaps you could investigate this further, I am sure that in the past 14 years technology was developed to provide you with good-enough information about the people at a certain IP address.
Imho the worst of the current implemented method of anti-cheat: it will not cover xlogging; if I have 2 IP addresses for example home and work, I could just use a VMWare session with which I could open a VPN to my work. You would see my home IP and work IP and there is NO WAY you can tell if anything is wrong. I could also sit at home and ask my neighbor to grant me access to their wireless network... if you really want to limit the xlogging, the best way is the whitelist (for now); there's always the option of issueing private certificates, but that would require payment...

Finally, I'm bothered by the fact that Bishop will not investigate the "Couples" issue that has been raised. My wife bloody hates Utopia so it won't benefit me, but I do know some people who would be very glad if you could tweak your changes a bit.