Evie Wyld is one of the most celebrated authors of her generation. She makes about £8,000 per year from writing novels. If you are a young author, you are probably lucky if you can match her success. These big publishers give back to the author about 12.5% (mostly through an advance), keeping the rest... With the same sales, as a self-published author with Amazon, Wyld would make making £45,000 a year (70%).
It seems to me that the author making 70% is the fair thing... the difficult part in making a book is not the marketing, editing or cover... the bulk of the work is done by the author... really... how is that even in question?
Unsurprisingly, many authors are trying to self-publish and they like it...
" 25% of writers had published something themselves. (...) Eighty-six per cent of those who had self-published said they would do so again.
I should add that big publishers require you to sign away your rights, whereas you get to keep them if you self-publish.