under 25 you wont get naf all [age we are talking] i try to avoid that age range anyway
25 up to 40 if they've had proper shitters all there life they will appreciate it if you've sold them a good car, and will text after a week, "just to let you know the cars great, thankyou for your help" was a recent one, and they will recommend you, now to me, thats better than a drink, because i dont have to spend on advertising, i don't have to discount to compete, and the sale is a lot easier and more relaxed,ie, i am not looking at folded arms .
i very rarely drink so sell the bottles on anyway .
40+ if you look after them they will return, and buy again, the sensible ones if they have a problem, and you sort it for them, and charge them, they will pay you more than asked, because, you've given service, you've removed worry, and they've got faith in you.
and that's very similar to a bottle or a box of chocs