the finisher is good even if you dont care bout it
It really isn't. Example from my game right now: it's 1654 and I have 4223 development (3434 autonomy modified). My income is 903.9 ducats per month. I'm running full level 5 advisors and I'm 544/406 force limit with 56k in the bank. My state maintenance is costing me 29 ducats a month. That finisher would save me a whole 7.25 ducats per month. I'm currently making 139 ducats per month and that's while spending about 100 a month on buying down corruption and reinforcing my fully professional army.
I could save more by deleting the useless forts I conquered recently and never got around to dismantling.