Jaroslav Bobrowski knows a good deal when he sees one. Accordingly, an all-you-can-eat offer at one sushi restaurant is no longer available to him. The triathlete follows a special diet in which he fasts for 20-hour periods. So when he does sit down for dinner, he tries to make up for lost time. But after devouring a staggering 100 plates at the Running Sushi restaurant in Landshut, Germany, as part of its $26 buffet deal, the restaurant declared him persona non grata. "When I went to the checkout, I wanted to tip, but the waiter did not want to accept...