Lots of these 'public servants' came in middle-class and will leave rich. It's more than 'collecting a pension' - it's living well off corruptions and glad handing.
Someone, who is able, needs to write a carefully documented book about all the different Congress people who obviously gained wealth by being in the Congress. Until it is published they would do well to keep a low profile and watch their back.
A well written and documented book on the subject could blow the cover off from Congress (and maybe a President or two). It could help us get our government back from the depth of corruption, thereby cutting off at least one of heads of the evil "progressive" monster trying to devour our Republic.