I do buy ebooks from the Sony store. I consider my ebook purchases to be read-once throw-aways. Consequently, I am price conscious. I might not think that way except for the DRM. Once DRM goes ("Someday, my DRM will go" sung to "Someday my prince will come"
), I might be willing to spend more and not think of ebooks as disposables. But until then . . . Anything that I might want to reread or keep, I buy in hardcover pbook.