I assume that based on the way the figures work you are right @PleasureDrone
If my area is 9th for Strap-ons then I assume the data is the LH takes how many Strap-on’s they’ve sold and then calculates into which town’s they’ve delivered them to, this would then be fairly easy to say that an area is 9th for Strap-ons etc as they are mearly putting number delviered to an area into a top 10 list.
Then I guess they combine the data of all units sold to a town to get the overall rating, based on the other towns.
Additional: Do I get some kind of award for using the word Strap-on 4 times in a post??? 