Indeed. Why would a salesperson at an Apple store be entitled to more than the going rate for retail work? Merely because an Apple /engineer/ did an outstanding job? That's nonsense.
Can Apple store employees show outstanding performance relative to other distribution channels? Relative to other stores, or to online sales? If so then the retail employee is producing value and there are grounds to demand higher compensation.
But if the cash haul is universal across distribution channels, which it is according to the article, then the folks entitled to a bonus are working back at 1 Infinite Loop.