Like with Michael Orthofer’s site, the large majority of books being purchased through links on this site continue to be print, although electronic format has steadily risen. This despite Amazon’s new claim that it now sells more electronic books than print.
Like Michael, I can’t explain why my site stats don’t reflect this, though I think it has something to do with the few megabestsellers (like The Millennium Trilogy) that have taken off in electronic format. I’m guessing that those are driving the majority of Amazon’s ebook sales, as well as Amazon Singles and perhaps Amazon construing subscriptions to blogs and such as “books.” (I don’t know that they do this, but wouldn’t put it past them.)
Other than that, I would guess that people who really, rally like books still prefer print books to ebooks. I certainly read my share of electronic books these days, but they’ve never felt “real” to me in the sense that print books do. My go-to example is that if I read an ebook and really like it, I will immediately go out and buy a print version of it to have in my library. Probably people who see books as more of commodities and time-killers won’t have that same perception and will tend to be happy with the electronic version, particularly since the gratification is truly instant now and the price tends to be lower.