I for one, would also have paid a higher price to get it in eBook format on the *real* release day. I read on my Sony PRS-505 and on my iPhone (Kindle books). I still read plain old dead-tree editions from my local library as well.
For me, this book is one that due to its size, I would really have paid a premium to have had it as an ebook on release day. I can't imagine toting around "Under the Dome" hardcover anywhere, and I'm one of those goofs that chooses her purse size so it fits my Sony Reader and iPhone.
Edited to say, no, I wouldn't pay $35 for it on release day... but I would have paid more than $9.99. Let's say... $15.