Last week saw the closure of three productions, with Death of a Salesman and Cats: The Jellicle Ball reaching new highs in the final week of their runs. The typically high-grossing play, starring Nathan Lane and Laurie Metcalf, saw its highest box office yet of $2.5 million over its final seven performances and was the highest grossing show in the industry last week. The average ticket price shot up to $239.61, which was also the highest in the industry last week. Still, the play, which was capitalized for up to $8.9 million, has not announced recoupment after playing its final performance Aug. 9. Cats: The Jellicle Ball also hit the…