Why would I pay $14 for the e-book? I can't do anything with it when I'm done reading. I can't give it to someone else to read. I can't donate it to my local library. I can't sell it. Publishers -- you are charging too much for the e-book!
I could justify $10 as the book was quick to get and convenient to read on my Kindle. At $14, it's just $1.50 less than the hardcover which is a physical book that I own. I can't justify paying the higher price.