Hot and cold balls is the only plausible explanation ive ever heard for how this could be done but even then, at a maximum you could only get one tie exactly the way you’d want it so what’s the point of doing that in an eight match draw? Unless they are throwing the balls into the freezer mid draw when the guy is talking bollocks
Again though I think that scenario fails because you have to convince the guest ball drawer to be in on it.
What are the other reasons? Not that I don’t think there are other reasons, just interested to see your take on it.