Over the years my subconcious has grown used to indexing the story according to certain physical properties of the book. "Oh yes, that happend about a cm in on the right side page, like halfway down" is something I might think- but this coordinate system doesn't work with an e-reader. Seeing the cover art each time counts, too. I also rather like (and miss) the small stains, tears and incidental damage that normal books get. There's also the matter of distraction - now that my book is a device I can't help but fiddle with it. Finally, even though the quality is very good on my Nook Touch, I can see the pixels and I find it distracting.
Maybe some or all of these concerns will go away in time, but then there's also the (rather stunning) fact that ebooks are MORE expensive than the paperback - this, even though the cost of production is negligible, and typically you can't share or bequeath your e-library, etc.
And then on top of all these objections B&N does something asinine like this...let's just say that I'll be perfectly happy reading paper books for a long long time.