There is an equation somewhere that quantifies our pay on a per passenger basis, but no one really wants to consider the ramifications, and there would be hurdles to overcome in spreading the risk of low loads to the staff. On the other hand, it would be a self-regulating mechanism to constrain costs in traffic lulls.
Consider this, if it was broadly applied across everyone employed by the company from the board to ground staff, I wonder what the result would be and what might be left for the shareholders.
There again,seeing as you have raised this, I'd be pleased if you can post this equation.