Are the QBs supposed to treat their linemen to dinner?

It doesn't have to be dinner after the game, but its usually a show of good faith after a game where the lineman actually protected their quarterback to buy the line something, sometimes its dinner, my quarterback would buy us donuts during Saturday morning film sessions, pro quarterbacks buy their line some ridiculous stuff, like watches, or taking them paintballing, etc. Its just a way for quarterbacks to tell their line good job.