I'd imagine they'd send all their resources to any given emergency, no matter what size they think it is at the outset rather than be faced with a situation in

I'd imagine they'd send all their resources to any given emergency, no matter what size they think it is at the outset rather than be faced with a situation in which they've responded inadequately. This would mean that if there were another emergency on one of the active runways (burning plane with passengers, for example), they'd not be able to respond with their usual full force which could lead to deaths and bad PR. I can see in this situation they'd rather temporarily suspend operations than have a diminished emergency crew. As for the cost, yes, but airlines are fairly risk adverse creatures and I'd imagine they'd have adequate insurance to cover such eventualities.