Read this entire tweet and you will be glad you did.

[Toorich]

28. A car salesman in a small Oklahoma town....

extended credit to an Iranian college student who had been denied a car by several other dealerships.
A couple of years later he got a call from the State Department, the car company Headquarters in Detroit, and the Office of the Shah of Iran.
It seems that college kid was the son of the Defense Minister of Iran and the nephew of the Shah.
The Iranian government intended to buy new cars and trucks for the entire Iranian military.
The Iranians would not close the deal until that Oklahoma car salesman came to Detroit and personally sold them the cars.
That decent guy instantly became a millionaire. He opened a dealership in an even smaller Oklahoma town and remained a good man until his death several years ago.
I guess the moral to the story is the same. It don't cost extra to be nice and sometimes it can pay dividends.
Anyway, that salesman also sold me a car on credit when I was barely hanging on financially and became a dear friend.