Buyer to pay a bonus for the real estate broker upon closing

[Sami Gren]

hi, I am sure I will get a few types of responses,  I am just wondering what the you ghyd think. 

Upon closing on a multi family deal, and obviously the seller is paying the commission for the broker, do you as a buyer think it would be nice or necessary to pay something for the broker just as a courtcourtesy? 

(I am asking in a case where there is only one broker involved,  or even when there is a sellers agent and a buyers agent).

   Thank you