I buy hardbacks new. I buy them used. I get them from libraries and from used book stores and as gifts.
I buy ebooks new, too - and sometimes I buy ebooks at the same time as I buy the hardback, so the publishers sure are not losing by me! I've got carpal tunnel - some books, like Gabaldon's latest, or King's latest, I simply can't hold to read. I ahve the hardbacks of both. I also have Gabaldon's in ebook, and will get King's as soon as its released, so I can read it. I love my book-lined walls, and on rainy boring days I love to browse through my library, pull out this book or that one, and settle in with an old friend. But ebooks are certainly convenient, easy to hold, easy to transport, so I like them too. I'd say maybe 15% of my ebooks, I also have in hardback. Perhaps another 2 or 3% in paperback.
And just to make the mix interesting, I also get audiobooks. Since I listen to audiobooks while driving, sewing, or (for really repetitive tasks) working, I don't really focus on them, so I only get audiobooks of books I've already read. That way if I'm distracted and miss bits, I don't lose the story.
That means I do actually have books in hardback, ebook AND audiobook format.
To me, what format I choose to read at the moment is very dependent on my situation at the moment. The publishers do not lose a cent on me because of ebooks.