From past experience, I have known several pro shop guys that were just average bowlers, but understood the dynamics of bowling balls and how to drill them to fit the cusomter's needs. On the other hand, I have seen pro shop guys who carry a PBA card and average 220 or more that do not have a clue about how to fit and drill. And yet I here bowlers who go to these PBA guys because "these guys are pros and good bowlers, therefore they must know what they are doing".