Commentators unanimously explain that the priests had a corrupt incentive. They 'fed on the sin' of the people because more sin led to more sacrifices, which was their source of income. Instead of rebuking wrongdoing, they encouraged it for personal gain, creating what John Calvin called a 'collusion' between corrupt leaders and a willing people. This serves as a stark warning against any spiritual leadership that prioritizes its own benefit over the holiness of its people.