I don't tip my pro shop guy for drilling. However, when I go in there and he does small things for me at no charge like open my thumb hole, or hit a piece with an abralon pad or what have you, I will give him $3-$5 and tell him to get himself a beer. Most of the time he says no, but I know he's busy and he's taking time out of his day to help me, so I want to compensate him, even if it's just a little bit.
I did have a driller once tell me about how when he would win jackpots he would give his ball driller a percentage of it. I'm not sure if that was true, or if he was just trying to get me to give him a percentage of my winnings.
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Ahhh Disco Biscuits!