You can mod that if you want. Just mess around with the descr_settlement_mechanics in you TATW_data folder.
I don't exactly know if you should change all those values up or down. My guess is down, for the upkeep at least. For taxes or trade you might want to go up. There might even be a tutorial somewhere on this forum (or try google
).
Point of note: the lines you are looking for all have SIF in front of them. Like this:
<factor name="SIF_UPKEEP"> ;Unit upkeep
<pip_modifier value="1.0"/>
The value="1" will be the number you want to change.
USE NOTEPAD++ You might not be able to start a campaign if you don't.
All this said, I would not recommend changing these files too much (I only slightly increased trade income and made population growth dependant on that). It will seriously unbalance the game and, in the oppinion of most of us here, ruin the fun. Change SIF_UPKEEP to like 0.9 or something, or SLIGHTLY increase trade income.
You will find that in the endgame (and probably long before that), even without modding anything, you'll have more money than you know what to do with. So be careful what you wish for