Coaching Salary Cap?

There is a salary cap for players in the NFL and I think everyone agrees that it works to promote parity.  However, there are no rules to prevent teams from spending freely on coaching staffs.  Does this give them an unfair advantage?As a Redskins fan I hate to admit that perhaps Dan Snyder is giving the team an unfair advantage.  He has collected quite a few of the best coaches in the league and is keeping them around by letting the money flow like water from a sluice gate.  

He lulled Joe Gibbs out of retirement for 5.7M per year.  Al Saunders was just hired at about 2M a year.  Gregg Williams makes almost 3M annually.  The rest of the staff are also taking home hefty paychecks relative to their positions.  It is serious enough that Commissioner Tagliabue has expressed concerns about it. (see linkfor more)

But would a salary cap for coaches do any good?  Would it be fair to impose such a cap?  And is it even needed?  One could argue that since the extra money that owners such as Snyder and Jones make from their well-ran franchises that they can’t spend on players (because of the player salary cap) has to go somewhere, then perhaps it is being better spent on top-notch coaching staffs rather than just lining the pockets of said owners.  It has also been mentioned in some circles that the amount of money that is being used to “lure” potential head coaches into better paying assistant coaching jobs is not anywhere near the stratospheric levels that players command.  

Some of the concerns regarding this issue have come from owners of teams which don’t generate the kind of income that Washington or Dallas do.  Revenue from ticket sales and memorabila are pooled and divided evenly between the entire league.  Some other sources of revenue, such as luxury boxes, in-stadium advertisment, stadium naming rights, and local broadcast rights are not pooled.  Low-revenue teams want some or all of that money to be pooled.  The truth is that many of these owners could employ the same strategies that high-revenue teams use to make the money they bring in; but they choose not to invest in such strategies.  It is my opinion that if anything is done at all it should involve a cap and not change the policy on revenue sharing.