That’s true, but think of this. Most of them are rich and they didnt make all that money from salaries.They will miss all that juice and insider info from lobbyists.
And I think most of them simply hold on for the perqs and prestige. Why else would Byrd or Spector stay on so long after his expiration date (metaphorically speaking only .... well, come to think of it, maybe Byrd has expired. Who could tell?)?