Having an upgrade give 25x money gain seems a bit overboard...
Viewing post in A Game About Making A Planet comments
There's some balancing to be done, but that particular upgrade boosting income dramatically is kind of the point from what I can tell. It's a gateway ability designed to move the player into the next income bracket, thus letting them explore the next tier of upgrades. In other words, it's a feature, not a bug. XD I've seen it in other incremental games.