I had this happen in a LQS. And it was one of the owner's standing about 20 feet from me visiting with another lady. She saw me standing there because we made eye contact.
I left 4 bolts of fabrics (so figure at minimum about a $40 sale) on the cutting table.
I don't shop there anymore unless I'm really desparately looking for a fabric.
The sad part is it's the closest LQS to my house.