IPT if I remember is break within the box. So any 8 ball would be a fluke. Some league and APA rules I believe you win when it drops so you see people (like me) going for it. Usually breaking from the side aiming for the side of the rack. In this case the odds go way up if you know what you're doing, and you get a good rack.
I still remember the first time I dropped one on the break. I was like 11-12 and I didn't know a thing about the game. When it fell (which I never even paid attention) I was told by my dad I won. I never feel good about the 8 dropping when I wasn't going for it, I guess I am just weird that way.