Your point is well taken, but name me a professional negotiator that has had schools get into losing scholarships. It's true that teams have negotiators on the management side, but they are the ones forking over the dollars aren't they....it is the owners money and the players are working for that owner.
Who needs an agent in the real world of work/business? Although management still has negotiators, no I still say the issue with sports is more derived from the use of agents. I suppose unions could be considered in the area of agents, and IMO unions offer nothing but problems as well.