I've bought quite a number of ebooks, and find them to be priced very reasonably.
In addition to that, there are the hundreds of Indie books that are currently free. (Just check out the Freebie Forum for lists, etc.)
I'm very satisfied with the majority of the pricing of the books I've paid for. Of course, this is my opinion. Your opinion or experiences can certainly differ from mine.
I would say the Kindle is definitely worth it just for the free books. In the past 2 weeks alone, I've added over 400 free Indie titles to my TBR list!
Don