I'm very much not an Apple fanboy (Linux has paid all of my bills > 10 years), but have you ever been in one of their stores? Gonna guess no by your comment.

No, his comment is exactly right. As long as there are more employees than customers in the store, every customer is quickly approached by an employee and can make their purchase. As soon as the number of customers starts going over the number of employees, the employees basically start selecting which customer to approach next. Instead of a line where everyone knows their position in it, everyone's just standing around hoping they're the next one, or trying to form pseudo lines near a busy employee.