She knows it has been spell-checked. With an e-book, these assurances are not there. Anyone can slap an e-book together and offer it for sale. She also ends up with some data on her hard drive - not a book in her hands. People simply like to hold things they buy.
Many people shop to feel better.
There are a couple of effective ways to add to the perceived value of information products. You can also add to the perceived value of information products by increasing the price . Every product has a level of price resistance. The ideal is to find yours by experimenting and then set is just below that mark. Don't make the mistake of pricing low because production cost is zero.