Shia LeBeouf

I feel like it would be very difficult to survive when you move up a tier then, as people that are at 26 cities could still fight people with only 16, making it likely that moving up a tier would resulting all of your stuff being destroyed with little hope to fix it. Even on a smaller scale, it could still end up being the same problem. You also get people with very few cities and high infra per city that are already a problem, that would be even worse in a city based system.