Will shoot a pistol period, or shoot a particular pistol? I'd suggest even among the frequent trainers/shooters, there's likely some guns they don't shoot much so that might change the answer.
I mean, I practice or train with my rifle roughly monthly...but it's nearly always with the same AR. I've got a .30-06 that I've shot exactly one box of 20 cartridges through in 3 years. (I know, that's not handguns, but the point is the same).
Oh, and I completely believe the post by Tom Givens and the results of the Colt study. There's so many "carried but never fired" and flip-floppers at gun shops chasing the latest hardware the 7 rounds total jives quite well. If I had a nickel for every time I've heard someone ask for a handgun, holster, and box of carry ammo..and then turn down practice ammo this year I'd have...probably about enough to mail a letter. But it happens.
I was leaving the indoor range/gun shop today and heard a guy asking for "two matching 9mm pistols and a double shoulder holster because I've always thought that was cool." I suspect there's a lot more "because it's cool" guys than shooters.