The real problem here is that some clarification is needed on the camp rules. The highkeep basement is a great example of a place where it's not clear how many camps are there. I would say there's only one camp because a group could reasonably hold it all and be close enough to the mobs to engage them in a timely manner. However, who's to say that the basement isn't actually divided into two, three, four or five camps?
Normally this would be a non-issue because if you divided up the highkeep basement (or really any camp) between two full groups, neither group would get adequate experience, and so no group would have an incentive to come in and lay claim to either part of the basement when a group is already established there. However, the situation we have here is one where nerds like Quitis don't care about what's more lucrative overall, they just care about getting a little bit of inefficient experience at another group's expense.
Game-theoretically, this scenario looks kind of like this:
http://en.wikipedia.org/wiki/Tragedy_of_the_commons