In actual life I've had this! Twice!
First time went to look at an Audi S2 Coupe. Guy wouldn't even let me drive it cos he obviously thought I was wasting his time and didn't have the money. Two weeks later I bought my brand new Ibiza Cupra which cost me more than his second hand Audi.
Mate went to buy an escort Cosworth. Guy actually said to him "Theres no point me even doing a finance quote cos you can't afford it" he eventually ended up buying a Monte Carlo ltd edition Cosworth then took it round to the dealer to show the sales manager what he bought. I think the guy got the sack over that.