Since I got my Kindle, I've switched to ebooks. I too have some paperbacks left over, they'll probably end up donated to the library unread. If a book is not an ebook form, I don't buy it.
Just like with paperbacks, I do have price limits. Before I waited for the paperback edition/price, now I wait for the ebook version with paperback prices. I'll pay a premium for a favorite author only out in hardback, but nothing over $9.99.
I don't understand some publishers. I like the Stephanie Plum series. And if they had released a $9.99 version at the same time as the hardcover, I would have bought it. They've finally released an ebook version for $15. Why should I pay $15 when I can get a used copy for $2.44?
So in some ways, ebooks have changed my reading habits in that I'm giving up old favorites and finding new ones. I think someday we may see more authors self-publishing and cutting out publishers altogether.