So why should you care about Kindle For PC?
Simply put - Amazon provides you with discounted E-Books. If you have no problem using your laptop instead of flipping pages - then you can use the Kindle-For-PC to buy and read the very latest best-sellers at a discount.
Of course, you could buy used books - and then sell them back on Amazon - but paying 10$ a book instead of 25$ for the latest release hard cover sounds like a good bargain!
FYI: There are plenty of classical books available for free on Amazon for Kindle!
And Many More...