So if I understand the point you're making: Losing an argument provides enough evidence of your prior ignorance to prevent any net gain in your expectation of your own overall knowledgeability, at least relative to winning the argument.

I don't disagree, but I don't know why I'd care to base an emotional response on this kind of evaluation. I'm not fretting over my absolute position on the axis of knowledge, I'm just hill climbing. It's the first derivative that my decisions affect, not the initial constant.