The price I'm willing to pay (in any format) is directly proportional to my overall yearning to
read the book. Which in turn is usually dependent on the level of enjoyment I've experienced reading previous works by the same author.
In other words; if I really, really want to read a new release by one of my favorite authors... I'm not waiting. Period. And I'm barely going to glance at the price.
Ebooks haven't changed my overall valuation of the words I choose to feed my brain.