[Folcon]

> Books also don't have the secondary income stream of live performance

I'd argue with some forms of writing / publishing books are the secondary income stream.

There seems to be a growing audience for online serial fiction as well as technical books that are written by the chapter, where some readers pay for early access to chapters that have yet to be released.

The outputs of these are quite long, so at some point a block of chapters gets bundled into a "book" as well as an audiobook on occasion and then sold on amazon.

Some authors then hide / remove the earlier chapters (this is not universal), or add extra bits in the book and then publish this for people who are hearing that "This story is really good, get the book to find out what happens".

Not sure what the actual economics looks like at the macro level, but it seems some authors are doing it as their full-time gig.