Andy Murray and Venus Williams Play Traffic Tennis, But Does This Kind of Promotion Actually Do Anything?

Is it just me or does this seem like another pretty pointless publicity stunt from the WTA and ATP tours?  Andy Murray and Venus Williams have a hit of tennis in the main street of Miami on top of cars to promote the tournament. Im sure it didnt cost the tours that much to hire cars and get the players to turnout, but Im sure the money can be better spent elsewhere!

I just think that the level of prizemoney on the lower level tours isnt up to scratch and this kind of makes tennis look like a sport just keeping the rich and top players entertained.