I voted Other, probably for the same reason as others. It doesn't specifically matter to me what the pbook version costs. If the ebook version is good value, I will buy it even if the pbook is better value, but what I consider good value varies depending on how much I want to read something.
I don't typically buy new pbooks any more, but I do still buy them remaindered and used.
I've been buying a lot of Agatha Christie in used paperback lately because I'm not willing to pay the full ebook price - I just want to read it cheaply and pass it on. I ought to use the library, really, but I prefer to own the copies so I can operate at my own pace. (Which is to say, I've bought loads of them and hardly read any.
) I did buy the complete short story collections in ebook because the pbooks are unwieldy and I'll probably work through them quite slowly while also reading the novels.