What the heck is going on with Amazon ebook sales?

What the heck is going on with Amazon ebook sales?

There are 4,760,476 ebooks on Amazon right now. Well, not right now as I’m writing this a few days before you will read it. So right now there are more than that. How many? I waited half an hour and refreshed my screen and there are now 4,763,122 ebooks available....