Anybody who says "just buy tickets" is missing the point. My ticket money doesn't come with a condition that if the team leaves I get my money back.
But this does make me think about the idea that they expect a million people to be in on this. If people wont buy a game ticket, why would they do this? I realize that the game day experience is much more than the ticket price, but I feel like it's a valid concern.
I still like the concept though, because I don't hear many other feasible ideas.