Most people love STARs more than games. See the game and training of Fed, Murray and Djoko, tonight's roger vs. Stan game, certer court is all packed. We have enough audience loving tennis and stars.
The traffic and timing are reasons too, no subway going there I remember, at least last year, if you drive there, you may have to walk a mile from the parking area to the stadium because there are ALL cars.
And how can you ask your boss for extra holiday after 8 national holidays?