Because unlike physical products that people buy in stores, digital products cannot be touched, looked at, felt or looked inside in before making a purchase. When a person is deciding whether or not to buy a digital product all they have to go by to make their decision is the description on the sales page and the way the product is presentedno touching, no inspection no taking a peak inside.
That's why if you are selling your own e-book, course, software or any other kind of downloadable product, it is extremely important that your product "looks" professional. Why else would all the top internet marketers hire professional graphic designers to give their products a polished, professional look?
Simply put, professional eCover graphics can and in most cases will help you sell more copies of your digital product (s). Just to prove my point, here is an example:
Which product would you buy if you had to pick between

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Dear Friend,
Even though we are told to "never judge a book by its cover", most people simply can't help but choose what they buy based on the way it looks. And looks are especially important when selling your own digital info products.
Why?