Cool. Congrats.
So, let's say, around 80 books a month, at 70% royalties of $2.99; that would come down to $167 extra income (before tax). Not really enough to live on, but if you keep it up for an entire year, you'll be able to get a nice holiday (or at least a long weekend) out of it.
Also: if you release a new book, do your existing books see a spike in sales?
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