I was responding to your arguments without responding to your rhetorical questions. I will now respond to them, because you insist:
What one may gain from winning: Having convinced, and/or a sense of victory. You are in no way obliged to think this gain is a better gain than knowledge. Debate is in no way obliged to offer gains that are better than learning.
What the paramount reason for debates is: Pitting opinions against each other, seeing what case is the strongest, convincing an audience.
(Both of these answers are implicit in my previous posts and also implicit in the concepts themselves - the questions are unnecessary and irrelevant)
I note that you are not responding to my argument at all, even while making a point of details i'm not responding to. You are in the process of losing this argument. This makes perfect sense, since you consider losing winning. Now you will gain the knowledge of what i'm telling you. Win!