Mileage runs

For some Flyer Talkers mileage runs are a necessity to requalify or a luxury to boost their mileage balance, while for others mileage run is just another forum (<here>) on the FT page.  There is no doubt that a lot of mileage runs are done by FTers, and so gravy asks in this thread “How many FTers are Mileage-Running at any one time?”