As a former PSO; that gets difficult at times. Crazy how many people run to pro shops because they watched a telecast and saw a tour player bowl well with a particular ball. Wonder how many Prisms were sold after TJ shot 300 on TV. Same could be said about Pitch Blacks and Purple Hammers after Jesper and Jakob had monster seasons.
All a PSO can really do is educate the customer and try and point them in the right direction. But ultimately it is the customer spending the money.