Depends on the personal situation. An extension with 2 million users can generate a very meaningful revenue. My extension has only 300k users, but offers that I received over years [0] would have been significant in some lower-income country.
For example, your income for the 10k users will be ~ $ 1000 per month, users 20k ~ $ 2000 per month… 100к users ~10 000 $, and so on.
ARPDAU (Average Revenue Per Daily Active User) basis - In average we have $0.007-0.011/user, US is $0.018.
Extracts from two different offers: