Lobbyists assist in the preparation and presentation of information, arrange testimony for congressional hearings, and arrange and attend face-to-face meetings with congressional staff and/or Members of Congress or agency officials. This is what they are supposed to do.
They actually get to know members of congress and insure them they will contribute to their campaigns and secure jobs for members of congress after they have served. A legal payoff.
Bills are wrtiten and proposed for the benefit of corporations and not the people. No one should be able to buy or influence congress.
As lobbying is protected by the constitution, restructure it to only allow educational seminars for congress.