[nunez]

real estate isn't too different though.

one property can be yielding $3k/mo, which isn't a lot, until you have ten of them...

same deal. if OP churns out ten books, and they all cash-flow similarly, that's £60k/mo!

THAT is what FATfire means.

(in OPs case, since their take rate is 15% or so, this will be £9k/mo, which isn't FAT, but it's still a lot of money to make while reading Hacker News!)

[ghaff]

You're probably talking quite a few years of on-the-side work to churn out ten books. And, depending upon the type of book, they may only have a shelf-life of 2-3 years.

Also, they're talking about taking home maybe $100-$200/month (which has been about my experience for a tech-related book). $1K/month, to say nothing of $6K/month, to say nothing of this holding up over a period of years, would be very good for a technical book.