If I was going to buy a Kindle, I wouldn't want the ads. I would expect the price to be much lower if I'm going to have to deal with ads, basically free. When I pick up an ereader, I want to read. Period.
As far as the "deals", I don't really expect them to last. I use to look at the Gold Box deals, but now never look at them.
The $10 for a $20 gift card looks nice, a great way to get around agency pricing.