I have a little different angle on this. Now, I've put SEVERAL posts here saying to charge what you're worth, I generally charged higher than most places charged, but I put in a lot of extra work to make sure they got their money's worth. I believe in doing good work and charging for it. People go into their jobs and expect to be compensated well for their work, but want to go into a business and demand as much as possible for as little as possible.
HOWEVER, in this circumstance, I'm a bit backwards from most shop operators. You want to buy a ball online and come get it drilled here? GREAT, sign me up, I'm all for it. Despite me being a fan of premium pricing, I'd have taken that deal. Regular outside drill was $50, grips $5.50 apiece, slug $15, but you're saying:
1) I don't have to order the ball
2) $30 for two holes that don't need grips that will take me 10 minutes for the entire transaction
YOU HAVE YOURSELF A DEAL. If I get an order, I have to submit the order, deal with the distributor (ours SUCKED though), receive it, process it, enter it into inventory on the computer, drill it, and warranty it. Drilling 2 holes is as easy as it gets, and as much as I hate people being cheap and trying to work a deal out of me, I also hate the uppity pro shop guy who gets idealistic and egotistical. Again, $30 for 2 holes and 10 minutes of my time is a done deal, especially if you've made it that easy. You ordered the ball, you're telling me exactly where you want it drilled and how you want it done, I punch two holes with zero liability and we're done. Sorry, but turning that down doesn't sound like a smart thing to do.
Now I can understand why some people may not want to do that based on principle alone, I hate people treating a pro shop like it's a used car lot. This is a legit deal though, it's not like someone is expecting the same thing everyone else gets, but for cheaper. It's less work, and zero liability, so seeing if you can get it for cheaper doesn't seem unfair to me I guess. Now your attitude set me back a little, but if I got attitude back from some ego in a shop, I might be a little chippy about it too.