SO, the Store is in serious need of a makeover.
Most of the time when you search for something you get every other product showing up as well. For instance if I were to search for Starfinder, Any, Any, it will return DnD, PathFinder, et.al. and then other times it will appear to mostly work correctly.
Being able to see what's on sell may well be more effective then seeing what the top sellers are.