Best Seller implies loads of people bought the book. Put a absolute floor of a few hundred copies sold, in addition to comparing the relative sales.<p>You don&#x27;t want people to start questioning your brand (Amazon Best Seller in this case). We all know that World Record Holder doesn&#x27;t mean much on its own. You have to specify whether it was most pennies stacked on a toe, biggest soap bubble, etc. What TFA points out is pretty much that the title Amazon Best Seller is useless without specifying a category, or possibly not at all.