I'm curious about the hefty fleet of the guidebooks available for nearly all destinations in Europe. There's the big standard ones, Lonely Planet, DK, Insight, probably forgetting an important one or two ;). And then some smaller companies.
But then there are a lot of guidebooks/travel books that seem to be one-offs by previously unknown and maybe even self-published (or published on demand? Some are only available as ebooks ....) authors. The quality of these varies widely, and not many are particularly comprehensive. More like "here's a bunch of stuff I did on my trip in a book that seems to be approximately a compilation of blog posts."
What I'm curious about is why do these books exist? Are they pure passion projects? A sort of minor leagues for aspiring writers? So many of them seem like they are written by older people and retirees. Are there tax advantages to writing these books? Like from a USA perspective, can you write off parts of your trip if it's taken for your "travel book writing business"? I would imagine if so, that you have to make some money in your travel book writing business before you're taking tax advantages?
What are your thoughts on these sorts of guides? I think they're kind of cool, a sort of democratization of guide writing enabled by contemporary technology ....