Thinking less aggressively, doesn't the real problem of agents lie with the clubs themselves? The clubs rarely, if ever, act for the common good of the game. They all subscribe to a devil-take-the-hindmost philosophy where schadenfreude rules. If the clubs acted in unison to curb the power of agents the game would be better for it. But they won't because they all want to screw their rivals and if a suitcase full of money to a third party is what it takes they do it.