It's pretty hard to make a sale when your customer knows more about your product than you do.
This may be true for generic logic devices or caps and resistors, but with complex devices or single sourced items, the customer may and should have many questions for the SE. For example; part availability, lead time, delivery dates, life expectancy of part, to name but a few.
The sale's already made if the product is any good, I already looked up the specs and got the pricing from a distributor. Makes you question the utility of these sales guys and their damn emails and phone calls and dropping by the office and all. "What's the contact resistance on that connector?" "Uhh... I could look it up and get back with you..." "What's type of interface does that LCD panel use?" "Uhh... I could ask somebody..."