From a while back, The Authors Guild [sic] on what’s “fair” in ebook royalties. What’s interesting here is the history of how and why ebook royalties are what they are, as well as the breakdown of exactly how much authors receive when their titles sell as physical books versus ebooks. Basically, the argument is that ebooks are proportionally (and absolutely) more profitable for publishers than for authors.
That being said, the Guild is comparing ebooks to hardcovers which… isn’t necessarily the fairest comparison. But, yanno. The Guild are authors, not mathemeticians. They tell stories, which is what they’re doing here. So take the numbers with a grain of salt.