Our Italy costs just went up

I heard that the airlines are raising money for fuel by charging $15 per bag. It's got to come from somewhere and the heavier the load, the more it costs to fly. If the passenger with luggage weighs more than say, 200 or 250 lbs., then charge for the overage per pound, not per bag. This would not be popular, but if it is fuel costs they're concerned about, it would be more logical.