Users reward it.
Within each model's own games, with opponents held at their leaderboard ratings, a game you can finish is worth about 83 rating points in head-to-head votes over one you can't.
Design Arena finds finishable games win about 83 rating points more in votes
AIDesign Arena says that within each model's own games, a finishable game is worth about 83 rating points more in head-to-head votes than one that cannot be finished, with opponents held at their leaderboard ratings.