I sent in a support asking for this very thing. the first reply was the auto reply they sent to people complaining about GW. Finally after i undated it a few times and added some foul language(hopefully i can figure out some nice words that will trigger my support tickets to be read by a real person) they read what i was saying and replied with "We can not arrange this request." I think the reward should outweigh the penalty for having a city. Here are 3 options.
1. let us abandon citys
2. Herby's idea of changing the reward for owning the city
3. resetting all of the koletons throughout the game to NPC.