Surely it would not be that hard to have the bots always discard from exile any non-ruin actions, treasures producing more than 1 coin, and night cards stranded there when given the opportunity to do so.
I just finished a 3-player in which the third human bugged out early and by the end, Lord R. had at least seven gold and a silver in exile, having bought them when a Gatekeeper was in play.