A Bookseller should sell BOOKS. This bit of worrying which format to support is stupid . Hard bound, Paperback or E-book.
Sell them!
Quit pushing the other stuff (first), when the customer wants to buy a BOOK (or other device)
Stores annoy me when they try and sell me other goods or service BEFORE they will take care of my selection or request.
Annoy me enough, and I GO AWAY.
