It was bumped from 100k lately, just this year.I don't think these are the actual numbers, but let's just run with that for the sake of the argument.
Maybe that's the reason why these devs are not using UnityE.g.: Caribdis - 6k Patrons, Zanith - 2.8k, RNGeusEX - 2.3k; and the creators of this Game are already sitting at almost 700...
Anyway, the income is varies greatly - you can see same 6000 patrons providing either 15k or 30k, e.g. on graphtreon.
The wanderer devs do not hide the income and it is just $6120/m.
Anyway, I doubt the devs will fully rewrite the game at this point, even if Renpy arguably better by the other points.