What's the incentive for Wall Street "to play dirty"? Analysts at investment banks need to retain good relationships with the CEOs of the companies (they are no

What's the incentive for Wall Street "to play dirty"? Analysts at investment banks need to retain good relationships with the CEOs of the companies (they are not allowed to disclose any market relevant non public information but it still helps tremendously with their work) as well as the investors (by making good forecasts and retaining them as clients).