I've never understood the allure of getting a ball drilled there. You're having a ball drilled by someone who doesn't know you, doesn't know your game, has never drilled a ball for you before, and it doesn't matter if you don't like it or something is wrong with it, because you've already finished bowling and are returning home, likely to never see them again. They're really just there to take your money because there's a certain buzz about getting a ball there. What's more, you're getting a brand new ball you've never thrown before, and you're going to try to get used to it during the tournament? And if you aren't planning to use it at the tournament, why buy it there? Nationals would be the absolute last place I'd ever consider getting a ball drilled. Buying one there? Sure, a lot of the time they have some good discontinued balls that are hard to find, but there's absolutely no good reason to ever have a ball drilled at nationals.