Has an AFL game ever ended 73-50?
Exactly once. On May 25, 2019, Richmond beat Essendon 73-50, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 73-50 in league history.
That makes 73-50 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 74-50 has happened 5 times and 73-51 has happened 5 times.