Fine. Notice I said "perhaps not conclusive?"Nope. Saying it's relevant doesn't make it so. It's only anecdotal evidence of one retailer out of hundreds that sell the game. It might be able to take a peak at being relevant if you gave us some numbers like:
Total Sales
Total Sales of the next few games on the list
Sales of GT5 at the same point in it's life cycle
Amazon Sales as % of total sales for an average gaming title..
etc...
Perhaps we're using different definitions of "relevant." I learned mine in law school.
Assuming GT6 is truly Amazon's top seller, and assuming Amazon is a major player in the global video game retail market, then every court in the United States would allow that as a piece of evidence in the trial of whether "GT6 sales are poor." Of course, "poor" needs to be defined first, and then compared to actual sales figures.
By the way, your items 2, 3 and 4 are not probative of whether "sales are poor," unless you define the word "poor" in relation to other titles instead of internal cost or profit projections.