Who knows, the client / MSC may think having facial hair on the shopper would create bias in the shop. They can at least control this in their shopper selection.
On the bright side, at least they aren't requiring hairline requirements or restrictions of shoppers who are balding. This would be a factor that would be difficult / complicated to control.
Shopping the Greater Denver Area, Colorado Springs and in-between in Colorado. 33 year old male and willing to travel!