If a book was published as a PDF file instead of a paperback, would you expect to pay the same price?

Normally, a PDF file (ebook) would be cheaper. It's not costing extra because there is no paper printed, no book covers or illustrations to pay for. I would most definitely ume it would be cheaper than the physical book. I would love to have all of my books on a bookshelf, however, that is not always possible. I buy the books beforehand to read them. If I like, I'll buy the hardcover (if available, since I am not a fan of paperback) and display it in my bookcase. Unfortunately, I've run out of room so nowadays I buy all books through my ereader.