It's the top selling product on Amazon and has been so for years. They have sold a ton of them, it's ridiculous to think otherwise. Who do you think was buying all the Kindle books before there were other supported platforms?

Amazon doesn't release sales figures. Period. Not of the Kindle and not of any product.

Your supporting evidence for this opinion is a blog post that offers no evidence whatsoever?

Amazon does however publish Top 100s of categories, and the Kindle has been consistently high in the categories related to electronic entertainment.

Perhaps the claim is that Amazon manipulates that list, next...