[spjwebster]

Having written a bunch of books on Flash and PHP back in the early 2000s, my experience is very much aligned with this.

For a relatively young guy the income was welcome, and after the first book did well I got a pretty decent advance for the subsequent books. They all sold enough to pay back that advance and so I got quarterly royalties on top too, but given the amount of toil it required - and quick turnaround times with new Flash releases, meaning many late nights - I would have been better compensated doing pretty much anything else.

That said, money isn't the only, or even necessarily the most important or fulfilling, reward on offer. I got the writing gig because I was spending a lot of my free time on various Flash-related forums answering questions and helping people with their projects. I did that for the sheer joy of helping others along in their learning journey, and saw writing books as a massive extension of that.

It very much mirrors my experience of the public school system in the UK: teachers are chronically overworked and underpaid, but do it anyway because it's something of a calling. In fact, that probably applies to a bunch of other public sector roles too, not least the NHS primary care roles.