"tell your employees that they should do whatever it takes to make customers happy as long as it isn't totally unreasonable."
Evidently you have to make a purchase to get a bag at Sears. So that is not as unreasonable as you complain it is.
But I am glad that the place where you recieved your haircut was willing to give you a bag...but then you did not just walk in from the mall and ask for one did you? You made a purchase.