-The average self-published book sells 250 copies
-The average self-published author makes $1,000 per year from their books
-33% of self-published authors make less than $500 per year
-90% of self-published books sell less than 100 copies
-20% of self-published authors report making no income from their books

source: Self-published Books & Authors Sales Statistics. February 2, 2022 by Nicholas Rizzo