Because a team trying to hold a city hostage would have even more leverage with OAK and SD being empty and being well established football markets.
I don't understand why the Chargers cannot get a deal done, especially one like the proposal they shot down. That makes NO sense. I've never been in that stadium, and I'm sure it's not a palace but how much more money does Spanos need to make? I don't get why these NFL owners are always trying to outdo/outearn/outego each other.
I think it's part of the decline in ratings and interest myself.
