Has an AFL game ever ended 73-17?
Exactly once. On May 13, 1911, Sydney beat St Kilda 73-17, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 73-17 in league history.
That makes 73-17 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 74-17 has happened never and 73-18 has happened 1 times.