There are some publishers who have abandoned DRM. I think most will eventually.
True, but AFAIK (and I could be wrong; I haven't checked in a while) the TOS is still a licensing model, and Amazon (or whoever) maintains the right to go into your reader and alter or delete your books if they so choose. I just don't like giving money to that model, or saying okay to anyone else having access to my collection.
(Yes, I could convert and back up my whole collection (possibly violating the TOS in the process?), but that seems like a lot of work, especially considering that I prefer the aesthetics, if not the inconvenience, of reading on paper anyway.
It's sort of a combination of "the principle of the thing" and it just working for me to read classics on my Kindle and modern fiction in print -- doing that wouldn't work for everyone, of course.)
Edit: Also, in practicality: If I buy a paper book, I own something of value that I could resell or give away. If I license an ebook, I am . . . renting access to it indefinitely. (Borrowing/lending restrictions used to be something else that REALLY bothered me, although it seems they're loosening up on that now.)