As a consumer I care about a cost centric view.
If the ebook is higher than the book i'd likely pirate it out of principle.
When business becomes visible to the consumer you run the risk of the consumer not liking the business. Things like limited runs of e-books (fucking really?), charging more for e-books, or releasing paperback weeks before the ebook are all consumer visible business.
I don't see e-books as a convenience, I see them as a more cost effective and eco-friendly way to obtain books because you don't have to pay for the paper, the binding, the press, etc. In this view the value of an e-book comes from the fact its cheaper, trying to charge more for that removes the whole point.
But in a larger view, I have always looked at value based pricing as cancerous. I avoid phones without removable storage for this reason, I avoid apple products ever since I got my first apple product as a gift, for this reason.
The price of an item should be the cost of the item plus a modest profit margin. Anything past that is crony capitalism.