Keeping the customer happy because of a fault the PSO did not commit?
How about Motiv keeps the customer happy that THEY caused an issue with. It wasn't the PSO who manufactured the ball out of USBC specs. It wasn't the PSO that had the ball uncertified. It wasn't the PSO that had to offer replacement balls. So where in that equation does it equal the PSO is required to do something because he/she screwed up? NOWHERE.
15 minutes to drill a ball huh? You need to go to a different pro shop. Before a new ball is drilled, the PSO should look at your current bowling balls to ensure your PAP has not changed, which might require you to go out and throw a few on the lanes. Let's make sure your grip is still good because the human hand is not static. As we grow older, we normally become less flexible and we may need an adjustment in span length and/or pitches. Did you lose or gain some weight since the last ball we drilled? You might need different sized holes or grip sizes to account for the change. The PSO then maps out the ball based upon the specs and the reaction you want. Probably should also weigh the ball to make sure the after drilled ball conforms with USBC specs. Need that bevel hit a little because the cut is too sharp, yep, the PSO does that after drilling as well.
Bottom line...if you want someone to spend 15 minutes punching 3 random holes in your ball, no wonder everyone thinks it is ok to either give away free drilling or reduced drilling.
If you want someone to know your game and the person to take time making sure that this next ball, that for some people might be the only ball bought new this season, is the right ball with the right fit, then find a qualified PSO that has an hour or more of time.
As for profit...there is overhead with the bowling alley...have employees? need to probably pay them a wage. Every pro shop I have ever went to, if you bought a ball from the PSO, future surface changes, quick cleaning on the spinner, coming out to watch you bowl with the new ball, and countless other items is included in that "profit". If being a PSO was so profitable, the industry would not be losing PSOs at an alarming rate.
More often today, the PSO is just a guy that can drill 3 holes in a ball, not a trained professional because everyone thinks the PSO should be able to live off of $20 a ball and feed his/her family and pay his/her bills.