Post retirement, same congressman get hired as an executive for the company or congressman starts an startup which is brought by the lobbyist company or ...
There are far more complex ways for congressmen to receive benefits for accepting lobbyist agenda.
Any action by congressman that doesn't make sense to common mass is result of lobbying. Every human being possesses basic intellect to konw what's good/or not for us and its the greed that persuade them to act differently.