Last time I bought anything ever from Amazon was when they were only selling books. I had spent a few hundred each year. Enough for them to send me gift, like coffee mugs.
Then I encountered a problem on an unrelated website, where they greeted me by my name. There was a button where I could find out how they knew that. They said that Amazon considered them a business partner and allowed them to look at Amazon servers for my personal info. I immediately changed my credit card number to 123456... and my address to fictitious and my email to info@amazon.com. I never bought from them again.
Then I found out that there was a law suit against them regarding privacy. They only changed how they deal with people under 18.
Just beware.