So all your eBooks are bringing in $60 / month in total? For the incredible time investment required to write books, that is quite discouragingly low.
I don't spend as much, and yes, coffee can be so much cheaper, but it's also not a lot of money.
Interestingly, the following guy has a recurring theme on how trying to save on lattes is inefficient and distracting (similar to the idea of premature optimization in code):