Coaches can continue to make millions of dollars, fine. Does quality of life change that much for a coach who is making $3 million compared to a coach who makes $6 million? You still have to get up in the morning, put on your socks one foot at a time, get to the office early, work all day, recruit, and retire at 75.
If you are satisfied at $3 million, then I just don't see how 6 moves the needle that much. There are only 2 scenarios where I see how it could make much of a difference: 1) Insurance: A head coach loses his position and spreads the extra $3 million/year over the number of years at a new position. 2) You leave the extra money to family/children.
But again, how is $3 million just not enough, no matter where you are? How many yachts are you going to use at retirement? How much floor space do you really want in your house? I think most are just infatuated by the number, and don't consider much else