In the old days, I guy would saunter in to the pool room and, after a casual look around, would talk a tuna into a game, for just the time. Then, he'd spend ten minutes inspecting every house cue until finding one that was acceptable. During the game he kept up this constant monologue. Whatever he was saying gradually had its affect and the game changed from time to time and a fin. At that point, the guy would go out to his car and come back with his "real" cue. Taking it out of its case and screwing it together would sometime put fear into those opponents not familiar with custom instruments. Now, the player needed something to break with. For that selection, he just walked over to the nearest rack and spent maybe five seconds picking something with a half way decent tip and some weight - more weight than whatever his custom came in at.
Now, I say all of that because I can't for the life of me figure out why a pro would spend months getting used to his game stick, only to use "my break cue" to make the most important shot of the entire game. I think it must be marketing.