What good doing brings back — return earned, not extracted; in this house's games, the reward is the words.
Old North French rewarder (to look back at, take heed of), a doublet of regard, from re- (back) + warder (to watch, guard), of Germanic origin; a reward was first the attention paid back for what someone had done.
What good doing brings back, and in this house's games that return is never taken from anyone else — the words themselves are the whole of it.