The problem is that Starcraft is a bad model, because in Starcraft, all the options are known in advance. In the real world, not so. Someone can invent something new tomorrow and all of sudden you may find those cash handy.

Also, 2-player Starcraft is an antagonistic game. In the real world, there are coalitions, and the game is more complicated. Having cash on hand can give you an edge when the coalitions change.