Do you think Ninja Kiwi challenges reward too little?

Ninja Kiwi challenges and achievements don't pay you back well. For example, most daily challenges in BTD5, ESPECIALLY the one on February 24 2017, only give you 20 dollars, and some of them are EVEN harder than the higher-paying main game. And in BMC, there is an achievement that requires 2500 successful attack defends, which takes an extremely long time, and it should be the highest rewarding achievement. It's not, does not give that much AP than what is expected for it. So, can you answer the title? Also feel free to delete it, I don't mind if it is deleted, although they still need to do something about it.