When you use the glitch you dont gain money you lose it. if you notice as you pop bloons the money lowers because its in the negative, but theres no negative sign.
If your having trouble with the game do what i do and just buy skelly archers and warriors. then dont put auto on. once most defense dies send em out to destroy buildings
 "Bloons Tower Defense 2"){kind=icon}
 "Toxers"){kind=icon}
 "Warlords: Call to Arms"){kind=icon}
 "Necronator"){kind=icon}
 "Sonny 2"){kind=icon}
 "Ninja Rinseout"){kind=icon}
 "Epic War 3"){kind=icon}
 "me and the key"){kind=icon}
 "Cargo Bridge"){kind=icon}