F2P / medium spenders just lose their hope to fight you, so yea they leave you alone to play in that server..MAYBE after you are not active there anymore ppl will flock back but that's just maybe..

But yea if you going to be a heavy spender, don't * your nose on the newer server knowing it might die because people get demotivated so easy nowadays, join the S1-S20 server where all WHALE run rampage against each other.