My food for thought for aspiring KDP inforpreneurs:
If you look at
umo98's chart above, you can see:
1 - he is earning close to $700: that's GREAT!
2 - he does not mention how much he spends on content / cover creation or ads/ You need to substract those expenses from the $700.
3 - Then remove the taxes. How much is left net in his pocket?
4 - Also, look at his number of books published to reach that: 894. Quite un-manageable in terms of optimizing your ads, costs, etc. I assume most of those books are low-content and less than 10-20% of them are responsible for 80% of the earnings.