This is to avoid the one way traffic of paying out enormous rewards once the transaction has been completed while the responsible staff would come out unscathed when the deal turns sour later. To avoid another financial tsunami, a financial institution should adopt a check and balance approach in management. In the heyday, deal makers in a financial institution are the golden boys.
They tended to disregard those who are supposed to control risks. Normally, when there was an argument over whether a certain deal should be done, the senior management, whose year-end bonus may depend on the current year revenue, or who are more concerned with the profit and loss account of the institution, would invariably stand on the side of the deal maker.