I seem to be reaching more readers now that I've published my books on Kindle. I'm not sure if it's an indication that Kindle is being used more widely than I'd imagined, or if readers are simply more willing to buy an eBook for $2.99 rather than a paperback for $9.99.
In terms of royalties there is not a huge difference between a Kindle sale and a paperback sale for me as a writer. Printing and distribution costs pretty much make up the bulk of the price of my books. And by buying books for Kindle instead of paperbacks readers are helping the planet. I'll have to see how things go, but I may decide in the future to publish Kindle books only. Although, I'm still trying to get used to my Kindle. It's fine for when I'm out and about, but when I'm indoors I still like to curl up in bed or a chair with a paperback or hardcover book.