Now that I've made the switch to the Kindle, I just refuse to buy hard copy books. It's a waste of paper and waste of storage space around the home.
Occasionally, I'll run into a title where the kindle book is priced higher than the softcover edition. If it's a dollar or so difference, I'll buy it. More than that and I'm probably going to take a pass.
In this case, we are talking a $3 premium over the standard softcover and almost double the price of the Mass Market Edition paperback? I also can't sell a used Kindle book the way I can a paperback.
Cost on kindle editions are lower, no materials cost, printing cost, storage cost and shipping cost. Profit margins are already higher, even if the Kindle edition is priced the same as the softcover.
I love Stephen King and would love to purchase this book, but I just can't do it. When the publisher stops being greedy and sets a reasonable price, sure. Of course, I may never stumble back around to this title and in the mean time, another author and publisher will be getting my cash.