Playing a tile on Bloons Monkey City Mobile (on Android) later rounds don't seem to give me as much cash as I expect. Normally you get $1 per pop, but for eg on a tile with 29 rounds I am doing round 27 and popping hundreds of bloons, but my cash is only ticking up slowly.
To confirm I started round 29 with $538 and popped at least 12 MOABs, a lot of ceramics, and one ZOMG. I finished with $1099, which seems a lot less than it should be.
Is there some sort of diminishing returns at later rounds? Is it that certain monkeys don't give a reward for popping?