To me there are many more reasons to be here than any 'winning a debate.' It is common knowledge, or at least should be, that some individuals are incapable of admitting even the most minor of mistakes for various psychological reasons. Toppling a 'worldview' is both uncommon and difficult, although it apparently has happened here on occasion judging by the difference between past and current posts along with personal testimony.
As others have stated, I find the personal, and often interactive, learning more valuable than any victory in this debate. I find that even the news travels faster here, and usually with more accuracy and detail than provided by the mainstream media. On occasion, the forum even provides a way to test some of my screwy hypotheses just to see if they have any value.
For me the debate is only a small part of a larger picture.