For all Amazon shoe sellers out there, including myself, this is not good news. What Amazon is doing with this remains largely unknown at this point. The big question is, if the top-level sales rank is no longer accessible permanently, are shoe sellers still be able to make sound shoe buying decisions? The answer is yes. Sellers need to rely more heavily on other metrics, such number of shoe reviews, Keepa pricing history, and so on. I am now anxious to see what Amazon is going to reveal about this latest change. Update (01/31): folks who are sourcing at the Nike outlet reported that shoes there are doing fine with sales rank, and I confirmed online that RevSeller is able to pull accurate sales ranks for this brand. RevSeller now is able to display top-level sales rank via parent ASIN. It's reasonable to believe that Amazon is now grouped shoes under "Shoe, Clothing & Jewelry" category and as a result, many shoes are now receiving a higher top-level sale ranks, while their sale velocity remains unchanged.