I do actually own a Kindle DX. I bought it because I read a lot and I read fast and frankly my thumb could not keep up with my eyes. I also bought if because I have a retinal eye disease and backlight is very hard on my eyes. So, I agree that those of us who have a dedicated ereader to just be able to read aren't going to be the ones interested in the iPad. Even owning a Kindle DX, I do not regret the purchase or wish I waited, in fact, iShrugged.
