You know, Hewitt, there should be a rule that you actually have to be building a base inside of a city before you can reap the spice rewards from it. As currently this is rather silly, with people who picked up the low-cost village traits just spam out money to pick up a bunch of cheap villages and roll in tons of cash without effort.
The idea behind the villages was that you could build an extra-fortified base inside of one and end up with some extra chump-change rolling in. NOT as a primary source of income.
Of course, claiming them this easily will result in a rather interesting plot twist as soon as Hewitt mods my spice-seeking operations.