Not thinking about it too deeply, but wouldn't the team rules encourage some of the Really Big Names to join in, since there's less scrutiny on each individual player?
I mean, the Dunk contest has been goofy for a while, but the nail in the coffin was when the league totally shafted everyone so that Griffin could jump over the hood of that Kia.
I am all for making the Dunk Contest more like a session. I think we'd see more creativity in a more relaxed atmosphere.