Selling a Model S is NO effort. The reward is in driving it, in hearing the "Wow!" from friends and neighbors, seeing the "Tesla Grin" on faces as you punch the pedal. The car sells itself. Or, the internet takes the order.
I got a mug, a toy car, an extra parcel shelf (returned). I got emails from new friends, chances to meet Elon and George, free repairs. There are a hundred ways to say thanks, and I think Tesla really tries to use them all. To tell you that showing off your new car (best car in the world, drop dead gorgeous, wicked fast, amazingly safe), should be rewarded by giving you a perk, well I don't agree, is all. I get perks every time I drive it. I get perks looking out my window and seeing it sitting there in the sunshine. I get perks driving past gas stations with 30 cars lined up waiting to put explosive poison into their car.
And how are you to know which person convinced a new buyer? Let's say he knows two or three Tesla owners, or sees the car at the golf club, wanders around it, goes on line. Is not the guy at the golf club somewhat responsible? Or I show it off, and 4 months later the wife sees one at her friend's house, and mentions the fact to hubby. Who gets the credit? Do we keep a log of who we give rides and demos to? Do we go before an arbiter to see who gets what cut of the promo?
It gets complicated.