The BSM is undergoing major developments right now. If I'm not mistaken, the $100,000 that the mod now gives is only temporary to ease the testing of features that R@S is implementing. I infer, that once the latest build is "done," that the $100,000 will be greatly reduced.
I read a thread not too long ago (can't recall where) that details R@S' easy-to-follow advice to change the amount of cash yourself. Do a keyword search for it if having too much money is spoiling your experience of the game.
Hope that helps!