The Rules from Ultimate Campaign allow you to build a building in order to generate gold or capital. They assume you are going to combine rooms together in order too make your building, but a player could simply abuse the fact that each separate building gets its own dice to roll for capital checks.
For example I could make a small business that is 4 Pits, each Pit generates +1 gold. There are two possible ways to run this:
Combine the 4 Pits into one building and make 1 d20 roll making an average of 14 silver per day.
Run each Pit as if they were a separate building and make 4 d20 rolls making an average of 44 silver per day
These two options are not equal, and doing the second one isn't harder to do since in the capital check rules you can take 10 on the check, so you don't even have to roll an extra amount of times.
Am I interpreting this right? Is there a minimum size for a building or some other handle in place to prevent a player from paying for/building 20 Pits in two days so that way he can earn 22 Gold per day during his downtime?