I understand your concerns. What I had in mind for purchasing a city, though, was more so just to be able to put many of the ideas into practice. There are definitely downsides to such a venture, as you have mentioned, but it seems that most people need real world examples in order to get on board with certain ideas. If a city was successfully purchased and run as a more free society, my hope is that it would encourage others to do the same and lead to a kind of panarchy spreading throughout, say, the USSA.