In fact, I have never paid for an ebook at all – already in 2011 the ebook filesharing community was well developed, and today LibGen and Anna’s Archive have 95% of everything I want to read in English. Through Internet Archive scans of library holdings, Anna’s Archive now has loads of fairly obscure twentieth-century publications that I never expected to see in digital form unless I, or some other member of the community, had scanned and uploaded them ourselves.
Not snarking, genuine question: how do you expect the authors to make a living creating and writing the content you enjoy reading if you don’t pay for it? Do you only read content that authors publish for free?
For English-language works of fiction that I will read a single time, I have no qualms about downloading them. People in English-speaking countries could get these for free through their public library, whether there on the shelves or through ILL. What, I have to pay for them just because where I am, I have no access to such libraries?
I still buy a lot of physical books, but I tend to purchase only what I know I will read multiple times over the years. That means, in the first place, poetry. And since poetry is a genre where page layout really matters, and ebooks still struggle with complex and large-format layout, it is especially nice to have the physical book.
Trust me, I know books are expensive, they're probably my biggest line item after rent and food, but it really is meaningful for the publisher and author when you purchase a book.
edit: I also wanted to add that the publishing industry is decidedly low tech and a huge amount of assumptions about what gets chosen to be published is based on historical (mediocre, for a host of reasons) sales data via Bookscan, so when you don't purchase a book there also is is now one fewer piece of a demand signal that may lead another similar book to be greenlit.
Furthermore, I question your claim that me purchasing a scholar’s book would benefit hurting authors. At least within my own discipline (I’m an occasional researcher when a funded project comes along, and I have published on a number of occasions) authors do not materially benefit from publishing a monograph, getting an article into a collection, or serving as an editor of a collection. It’s all for prestige/career advancement alone. In fact, the PDFs on LibGen are sometimes surreptitiously uploaded by authors themselves, who have little love for the big academic publishers like Brill.
There are two cases in my own discipline where authors do care about sales. One is textbooks, and the other is a case where a group of scholars came together to found their own press so they wouldn’t have to deal with the big corporate publishers any more. But those do not form a significant part of my own reading.
I get your point about libraries, and if you outright don’t have access in your location that’s valid - one thing I’d add though is that libraries do have constrained supply and limited loan periods (even for digital content) and also a smaller collection of books so it’s not a total free access service as you suggest (at least in the UK, I can’t speak to others) - but now I’m nit picking.