The real issue at play is the fact that management is a boys club where success and failure is rewarded in exactly the same way....huge salaries and another job guaranteed regardless. The vast majority know that they will never win anything in their careers as a manager so the only thing left to do is make as much money as possible. If failure meant they where out of the game, maybe they would think far more carefully about players they spend a clubs money on but it doesn't so the merry go round of players following certain managers and patterns of transfer between certain clubs will never stop and its basically a vessel for moving cash around.