Sorry Steve2, but you're wrong.
I did the research and found that Amazon Best Sellers Ranks are based on sales, period. They are not relative to what you are purchasing or ordering as you stated. (See below how Amazon describes this themselves)
You are thinking about the ability for Amazon.com to suggest purchasing of other items based on your shopping habits. You're thinking about pop up ads in your browser that can do the same. Sure, that happens. But that is not what I was showing in my Best Sellers posting.
When it comes to Amazon.com Best Sellers Rankings, it's about sales only. Now, they do have many sub-categories so that genre's like "Jehovah's Witnesses" (under Protestentism under Christianity) can stand out. My book might be eighty some thousandth on the entire Amazon site, but it can be #1 in its sub-category at the same time. So, that is what I was showing for my original posting, that our books were currently leading the JW sub-category in sales.
Also, this list is updated hourly, so high rankings can come and go quite freqently. That is why I found it amusing to see Crisis of Conscience and my book together. That doesn't always happen because there are hundreds of ex-JW books out there selling all at the same time.
Brock Talon (author of Journey to God's House)