The financial benefit of heavy banked hubs with a/c sitting on the ground for less time far outweighs additional cost of missed connections, particularly when said missed connections can often be attributed to weather related and the airline owes the traveler nothing. Look at it this way. A CK/EXP flying often has either the corporate or personal resources to absorb additional costs when a connection is missed and the airline is not on the hook for hotel/meals. Everyone else the airline doesn't really have much of an incentive to please anyway. Moreover, heavy business travelers usually have contingent plans in place.