Tell HN: My early access eBook over iOS made $120k in 1 year

Hey HN - I mostly stay in the shadows here, but for the one year anniversary of my first (ebook project)[1] I figured I'd write a blurb in case it's interesting to anyone. I'm terrible at launching things, and take years to ship my own apps. After my last app was acquired, I wanted to fulfill a "moon shot" goal of mine - write a book in any form. I settled on adapting one of my more popular [blog posts][2] that I keep updated through each version of iOS into a five book series (one for each topic of accessibility, design, UX, APIs and a catch all bonus one). So far it has sold 1,534 copies and has made over $124,000. Now that things have settled, it makes about $2k a month on average. I learned from my own launch history and decide to launch it in "early access", otherwise I'd never finish it. Launching it went great and was a day I'll never forget, as to that point - I had never made close to that much money in one day. CONS: It's not