Has an AFL game ever ended 61-30?
Exactly once. On July 16, 1966, Richmond beat Carlton 61-30, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 61-30 in league history.
That makes 61-30 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 62-30 has happened 4 times and 61-31 has happened 3 times.