While it isn't super likely to happen in one given charge phase, it is a lot more likely to happen at least once in a given game.
There's 5 charge phases per turn, let's be a bit pessimistic and say that this event can only happen in 3 phases since you won't always be in range to charge. The likelyhood if it happening at least once per game is already 10-20% with your numbers.
Even if only 2 charge phases are relevant we're already looking at a 6-14% likelyhood.
So it really isn't going to be that rare an event to see unleash hell just devastate something powerfull, especially in a meta where heavy-shooting is going to be common. Sure you won't see it happen every charge phase, nor even every game. But it is is decently likely for
@Dread Saurian to see it happen to him at least once per tournament.