After twelve years in Congress, perverts knows the ropes about the pet pork legislative process and where the skeletons are hiding. Somebody is always looking for insider knowledge.
Perhaps someone has the figures, but I don't think most ex-congressmen do this well. We hear about the big names, mostly committee and subcommittee chairs, who cash out as big time lobbyists, but I think they are the exception, not the rule. I am ready to stand corrected if someone has data to the contrary.