The idea is to spear a building spot. The most gold consumer job is to play a hundred card games to get one additional building spot.
I got the idea, but the idea is just bad. Being able to manage buildings spots properly is a skill, that is required to make a decent account. I doubt that gold players use additional building slots in every side village, simply because it is not necessary. I never felt the need to use additional building spots in side villages at all and tbh I was fine in the capital aswell before the additional ones were introduced and I often don't even use them in hammer villages ... crop supply can easily be managed with trade routes aswell; also you can demolish academy and smithy when you're done researching and (if you have it) stuff like cranny, trapper, etc. to get more space if you urgently need it.
And worst case you can leave town hall out of the capital once you have a certain amount of villages, because capital parties will then only make a small percentage of your total culture production.