Has an AFL game ever ended 91-52?
Exactly once. On August 19, 1944, St Kilda beat Melbourne 91-52, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 91-52 in league history.
That makes 91-52 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 92-52 has happened 2 times and 91-53 has happened 4 times.