Interesting comment Howard!
I don't know what regional markets you frequent, but in my observation most business travellers flying regional services are in small to medium business and very keen to save a dollar when they can and the bulk traffic (VFR) absolutely choose their carrier based on price and schedule.
I agree with your comment about the corporate 'high flyers' who may train their PA's to spot different aircraft types from the published schedule information and book their travel accordingly, but their numbers are definitely in the minority on most regional services.