Does the price of a book affect your decision about buying it? Do you wait for cheaper editions of books you want?
If I really want to buy a specific title, I will often not wait for a cheaper version.
However, when I am not that interested in a title, a higher price will stop me buying it, whereas with a lower price I will purchase this title.
I do keep a keen eye on e-book pricing: I find they are often too high for the quality of the e-book on offer. If you want me to pay print price for an e-book title, please make sure your tagging and structure are native to e-books and not just a badly OCR-d version of the print PDF!