I’ve played custom games (Empire Builders) Â With custom maps, where incomes were in the 350 to 500 IPC range.
Let me tell you this… Â I’ve seen tough games come and tough games go, but the absolute most menacing, intimidating, energy taxing, and intense gaming I have ever played were these versions.
By the time you had placed your units, rolled some defensive dice, and got your purchase Ready, it was ALREADY your turn again.  Swaths, and swaths of units  would just dissappear into the board.  It’s like nothing you’ve ever seen.
We have fronts that were 15 to 25 territories long, (with terrain) where you’re units would just mush into your opponents  stacks of 15, 25, and 50 infantry, and you would watch MORE CHIPS THAN YOU CAN FIT IN YOUR HAND, dissappear from the board.
There is nothing like seeing 58 fighters blown out of a sky, in a SINGLE combat roll. Â Only to see half of them repurchased the following turn.
You DO NOT want to play the game at that scale, unless you have more than one player PER country.