I am at universal studios at the moment and saw the Goo Goo Dolls perform last night. When I bought a shirt after the show, there was an option to tip the staff member selling the shirts. Is this normal? There was both a tip jar (actually it was a box) and a tip button on the credit card machine. While he was working very hard to get through the queue quickly, I didn’t think merchandise sales people were tipped positions???!