Well I don't know for sure but I "think" you must subscribe to Traffic reports in order to obtain that information. Since it is free, I am going to try it again. And I signed up for the free 2 months of Marketplace Research as well. But I think the counters are for the Traffic reports.
If you have not subscribed to the Traffic Reports, activate it and take a look. It appears to me the info comes directly from the counters. Let me know what it looks like to you. The information provided is pretty good. Actually I think it along the same lines as Sellathon reports.