Actually the US government does very little to no industrial espionage
You should do stand-up
So you are saying they have to be smarter than average by definition. Curious argument you have there.
More specifically, they have to be smarter than average in the area of their sales. Also, it's worth keeping in mind that above average doesn't mean you aren't an idiot.
The sales reps for my company all have engineering degrees and are probably more competent with CAD and product design than 99% of the people reading this. The sales reps that sell equipment to my company know in exquisite detail how their products work and are quite capable of repairing it when the need arises.
My experiences have been quite different. Perhaps it is something that varies greatly by field.