"How on earth is this possible? After all these years?"
Well, as long as people buy the tickets, which they are, why the heck not? Sure, one person may get bored with it after a while, but it is a show a lot of people know about. People take their kids, then their kid's kids, and so on.
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611