I don't understand why change servers. I was automatically placed in one and plan to stick with it, especially as I don't mind spending in a game according to how many hours of entertainment I'm getting out of it. But judging by the amount of servers, I guess that's kinda intended. Get people to hop in, spend and see if they can be the best, and if they don't like it they just repeat it on the next day on another new server.
This said, I really wouldn't enjoy being adjacent to a kingdom with 300k power players in a week. The level of cash spent to achieve that is simply disgusting and should have been capped somehow. You would be fighting against someone that you wouldn't even be able to attack as the power requirement is impossible. Here in 118, it's a bit more than a week old and top 5 is ~90k, top 10 is ~80k, top 50 is ~65k. Apart from top 5 who is probably spending quite a bit on building speed, it still doesn't feel something impossible to fight against with a castle only 1 level higher.