If money was automically collect it would be too easy to get money just imagine the last 5 seconds of the level is double cash if you let the enemies stack up and just spray and pray with some good guns you would have alot of money
you actually don't gain money when you do the glitch your actually negative that's why you cant buy anything when you do it or if you do and you don't have enough for the upgrade
3rd track 45th round hard 3888 $ and i was going to call a monkey storm i click on it this bs game didn't even call it in and i lost i could of won without a super monkey w/e too easy anyways
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 "Bloons Tower Defense 4"){kind=icon}
 "Bloons Tower Defense 2"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}