If you're actually paying for the books, de-DRM them. But pay for them.

I personally read on a Barnes & Noble Nook, my fourth e-ink reader. I absolutely love it, I would go so far as to say that the current generation has a _better_ reading experience than dead trees. But I use Calibre and remove the DRM, for the same reasons that you state. I view the books not as entertainment but rather as culture. Culture worth preserving.