I probably read two pbooks for each ebook that I read. The biggest reason for that is that I only buy non-DRM ebooks. Yes, I could buy a DRMed book and strip it, but if that's what's necessary, I'll just stick with the paper book. Why encourage them?
My ebook TBR (stack|shelf|directory) is fuller than my paper stack (by a factor of 3 or 4) but the limited number of e-publishers with a clue means that the flow of new books is still heavily weighted towards dead tree.
I'm perfectly happy to read either way -- I like the convenience (especially while travelling) of ebooks, but like the ability to easily share a paper book. Also, if there are graphics at all (maps, etc) then the pbook is superior.