In each round, only one reply can win, and the voting isn't always fair.
This means that as groups get larger, more and more great replies are left in the alternative entries for each round.
Even in throwaway games, it's worth reviewing the alts to find hidden gems (and figure out who was robbed).
And when you play games as ideation for a separate piece of writing, the alts often contain great material to be incorporated into the later draft.