The recorded drop rate on Wowhead is pretty telling, as it is currently “equal” to the Heartbreaker. Seems like whoever put it in simply copied the Heartbreaker’s drop table instead of, you know, actually making the chance equal the other holiday manuscripts at minimum. I’ve done 14 attempts a day despite already having the rocket from last year and no dice.
EDIT: Going to tag the original CC thread on this dating back to Hallow’s End since this situation is the most egregious so far.