One of the first things Voss did after taking office was to reduce taxes, and this policy immediately saw success.
When he was with the Mairente Family, the taxes on the townspeople were quite high because, although the Mairente Family was powerful, their strength was sustained by money. Where did this money come from? Naturally, it was borne by the Sky Cities under their rule.
In comparison, Rocky's reliance on this was much less. Although the population and industry within Carltos City could indeed provide a large income, if he treated the city as nothing more than a juice extractor, merely squeezing Gold Coins out of it, that would clearly be a terrible move—one that Rocky was surely not going to make.
On the contrary, when Voss brought the tax reduction proposal to him, he immediately agreed, because as he had said before, what Carltos City needed now was stability; other matters could be discussed later.