For the life of me I cannot explain it, because the rise of distro carried Linux up the foodchain to mainframes and down to replace vxworks and ultimately dominate phones to spaceships.
Maybe it was people more than software?
I made a decent royalty, with a bunch of other terms which included buy-backs (e.g. returns) and other ways for the publisher to ensure they maximized their profit over mine. Over the course of 5 years I made roughly $35-40k, but that was spending a full year of 25/hrs a week on top of my day job, it works out to about ~$30/hr. I think if I were to quit my day job, continue cranking out 2-3 books a year, and collecting residual revenue, it would still be less than a 6 figure income (this was circa 2000 so $100k was +/-$160k equivalent) - certainly quite livable but also not stellar given that you have to be at the top of your field and on top of technologies all the time. My salary and my "side gig" contract rate were both hire at the time.
So...
Did I make much money? Not really.
Do I regret writing two books? Nope.
Am I proud of those books? Hell yes.
Would I do it again? Hell no. Way to much work.
Memory is a limited resource to be used judiciously, not an all-you-can-eat buffet.
While my coworker in the Bay Area got her a choice of surgery slots less than a month out.
There are trade offs.
ssh root@kerla-demo.seiya.me