Cool idea, however i think its too much money, instead i think it would be fair to have more money the stronger the town is, like frostmill having lvl 70 guards with around 70 cash per bag, while ravenna maybe lvl 175 guards with around 300 per bag.
would also be cool if all the navy would get a notification with a marker that spawns on you every 10 seconds, so they can track you down.
Nice thinking!