This has actually become very popular already in the Boston area, where Fenway Park sells out most of the Red Sox' season by February. While baseball is kind of a religion here, not everybody can fit in the church. Several local movie theaters show the local cable broadcasts on the big screens, sell concessions, and make it a fun time, from what i've heard. It's cheaper than tickets to the game, and moreover, for things like Red Sox-Yankees games, it's the closest most people can get. And yes, there is cheering, booing, heckling, etc. The local broadcasters like to have fun with the theater-goers by giving them marching orders to do 'the wave' and other things like that, and though nobody can see them, no one doubts that they're actually doing it. If it were in 3-d, i might consider it, but then again, i wait in line on a snowy december morning for tickets to the real thing.