Random gun owners often have odd opinions on shooting. Here is one example.
#>Plinker<# Just because someone has the ability to shoot X-targets in X-time in X-format confers no expertise outside that venue.
True, the concert pianist may not know how to play the trumpet. However, this knowledge of the fundamentals are solid. He already has a thorough understanding of musical theory, knows how to read/write music, and would be more knowledgeable of the instrument than some guy on the street. Furthermore, being actively involved in the field of music, he would probably know expert trumpet players and have learned some of their insights.
For all I know Kim Rhode may not be able to hit the broadside of a barn with a pistol, but her insights on the process of shooting would be valuable to any marksman.