It's apples and apples. Exclusives are EVERYWHERE. Whether it's the Knicks, NFL Sunday Ticket or Halo.
If VZ wants it, let them bid on it. Comcast doesn't own those teams. Those broadcast rights are up for bids to any network willing to fork over the cash. If Disney rolls up with a truckload of money, the would be on ABC or ESPN. If VZ creates a Sports Net and rolls up with a bigger truck load of money than Comcast, they'll be on Verizon.
These teams and leagues have every right to get as much money and make whatever deal they want. It's their intellectual property. You don't have a "right" to see the Knicks or Yankees.