Just a little creacher

no, royalties are not a significant source of income for most authors. if you wrote something like Project Hail Mary, then absolutely, the royalties would be substantial! but that's like winning the lottery. Ryan Gosling is not starring in the movie adaption of most books.

when you sell a book to a publisher, you get what's called 'an advance against royalties'. it's usually split into multiple parts, so you might get one third for the initial sale, one third for the final revised manuscript, and one third on the publishing date.

an advance against royalties is the publisher saying "we believe you will eventually make X amount in royalties, so here it is ahead of time." and then you don't actually see any money from royalties until the advance is paid off. most books do not make enough in royalties to pay off the advance (I have two children's books and one fiction book, and have yet to see royalties for any of them).

advances are still great, but you need to make them stretch! for instance, last year my net income was about 30k Canadian (21k USD), which is fantastic when you consider that I mostly made it through writing. but I'm definitely not a millionaire. I can live off my writing (not trying to undersell that!) but I'll probably remain in a low income bracket for the foreseeable future.

The Erlkönig Hanno Karlhuber, 1993

Like this. And it’s beautiful. It’s beautiful to hear a soliloquy I loved so much already, and have it come to life in a way it never, ever, did before. I feel like I grasp his motivations, his twists and turns, no longer on an academic level but on a visceral, instinctive one. Because he’s presenting his mental and emotional journey in a way that speaks honestly, like a real person.