As it has been with paper for my whole life, I will spend more for a good hardback because it's a collectable object, and I'll pay new paperback prices for other books (paper or ebook) if that's the only way I can get them.
But generally, I pay used book prices for most of my reads. At $4-5 I can afford to read a variety of books. At higher than that, I really can't.
So in answer to your question: if the ebook is priced higher than a paperback, no I don't buy it. I don't begrudge the publisher the higher price, I just don't buy it. I wait until it's cheaper, or there's a sale, or I find it used or at the library.