As Quoted by Evony when you click C0ntact us on the Frequent asked questions
7. My NPC City Disappeared, Clearing npcs.
For Evony to maintain a balanced and exciting game environment, it is necessary for us to regularly clear Non-Player Cities and cities belonging to players who are no longer active. We understand that players use Non-Player Cities to support their armies, so we do not clear cities that are level 5 or 10 if they are within a reasonable distance of any player city. Other Non-Player Cities must be cleared on a regular basis to make room for new players to join servers. This keeps servers alive with competition and new challenges.
I spent a descent amount of money too and it pi55es me off i lost a couple of 5's and 10's that i farm but they havent taken away some 2, 3,4 6 that i dont farm.
its ok to clear flats once every 3 months to add some actions to servers
but stop taking out 5's and 10's

