I saw the news about the crazy price for this book come across one of the websites I visit and/or Twitter the other day. Today, I ran across an explanation of what was happening in this instance. Michael Eisen writes:

Amazingly, when I reloaded the page the next day, both priced had gone UP! Each was now nearly $2.8 million. And whereas previously the prices were $400,000 apart, they were now within $5,000 of each other. Now I was intrigued, and I started to follow the page incessantly. By the end of the day the higher priced copy had gone up again. This time to $3,536,675.57. And now a pattern was emerging.