Haha. Love the analogy. It reminds so much of the derivative crisis.
It makes sense from stubhub's point of view. The more transactions, the more commission they make. This strategy of shorting alone probably nets them enough in additional commission that they themselves could make right to any customers who end up without tickets (not that it's their responsibility to do that).
I just went to stubhub right now and before it even lets you buy tickets, a message pops up talking about buying tickets in "zones".