Ok. Let me clarify:
If you spend $50 on the game buying bloonstones, you will have enough bloonstones to never lose at any levels. Imagine if other games had this mechanic:
Lost to the elite 4 in Pokemon? For only $.5, we will revive your pokemon and give you a free rare candy!
Losing your lane in LoL/Dota? For only $0.50, here's 1000 gold to let you come back!
 "Bloons Monkey City"){kind=icon}