There's a second high score table for buy-in scores, so you should get on the secondary high score table UNLESS you are buying more than one ball. Tell me you're not buying more than one.
I always disable buy-in on my machines. The only point of buy-in is to extract another coin from the player.
No think its only set to 1 I will disable it untill my son comes over. I just assumed it was a standard thing lol