Yeah, this is pretty sad. I don't really feel the need to comment on this type of thing (because IP address can be checked, etc.), but friends play together all the time. Mike and I have had TONS of games where we've gone all out on each other and others where we have seemingly not attacked one another. If Xavier truly has a problem, I'd request that he post other games for the moderators to review and research (there are TONS for you to review, so I'm sure you can find at least a few to support your case, right?). Once you take the time to do this, you'll find there is fair play.
There is a group that has followed me (as I've followed another friend) and we've all discussed strategies to this game. If that means we tend to play similar, so be it. We learned how to play from each other.