What's happening to my cash?
Apparently, this has been a mechanic in the Bloons games for a long time, and that is why Banana Farms are really important.
Here is the amount of cash you get per pop :
Difficulty: Hardcore
- Wave 1 – 15: $1
- Wave 16 – 22: $0.5
- Wave 23 – 27: $0.2
- Wave 28+: $0.05
Difficulty: Normal
- Wave 1 – 11: $1.1
- Wave 12 – 15: $1
- Wave 16 – 22: $0.65
- Wave 23 – 27: $0.2
- Wave 28+: $0.05
More info about BMC in this post.