The more choice the better. Inefficiencies in the system that produce what some see as a good deal leads to more choice. When you seek out and mitigate those inefficiencies (in which a pilot that chooses to trade seniority for either more money or quality of life as a senior first officer) you motivate an otherwise happy f/o to upgrade to captain denying a junior pilot that wanted the captain seat. The result is less happy senior first officers, less happy junior captains and more happy management.

Don't let envy lead us to a place where we are all limited to the same lifestyle.