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Re:Ask HN: Best passive income method for a solo developer? by iends on Friday August 19, 2016 @12:23PM (#12321173)
Is the market even large enough?

Have you thought about trying to up sell the entire book at the end of each summary? (Might get a few amazon.com clicks with each summary.)

Do you know your churn rate and the lifetime value of each customer? I imagine it's too early, but once you have a good estimate you will know exactly what you can spend on adsense to drive more PPC traffic.

Re:Ask HN: Best passive income method for a solo developer? by andygor on Saturday August 20, 2016 @11:25AM (#12326968)
It's large enough for a founder who run a project by himself, i guess. I don't know churn rate and lifetime value can be $20 or $40.