Duty Roulette can be equated to that hostess at a restaurant who tries to seat you at a table next to one with a screaming baby at it, rather than one of the 5 other available tables further away that you'd rather have, just so they can offload it on the first person who will take it. And then if you say 'No not that one, I don't want First Available now, I want that one over there.' they make you stand around waiting for 30 minutes.