Has an AFL game ever ended 90-30?
Exactly once. On July 18, 1914, Geelong beat Richmond 90-30, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 90-30 in league history.
That makes 90-30 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 91-30 has happened never and 90-31 has happened never.