You're extrapolating UNC losing to Wofford out to a higher seed wins more often than a lower seed in the tournament. What?!?
Let's ask 10 people if the UNC-Wofford game was a "big" game. Upsets happen.
What your win% by seed ignores is movement within seedings - UNC can go 24-6 and get a 2 seed, but would've gotten the highest 2 ssed if it went 25-5 (beating Wofford) and been placed in the regional with the weakest 1 seed. Yes, it's convoluted, but it's equally as convoluted as what you've already stated.
My point is that UNC vs. Wofford in early December wasn't a "big game", couldn't be a big game, and will never be a big game. Because it's one game in the NCAA basketball regular season. You're on the wrong end of the spectrum - the argument FOR big games (and the importance of) in the regular season are the big-time programs playing each other. Yet none of us has any idea the last top 5 team Kansas has beaten or the last regular season loss Duke had at home to a top 10 team.
Because each regular season game is completely meaningless - the huge upsets, the 30-point wins, the rivalry games, and even top 10 match-ups. It's all garbage. If college football goes to an 8-team playoff or 16 or whatever, the regular season will become irrelevant and people will only care about the playoff, a la the NCAA tournament. College basketball matters in March only. People watch in March only. People pay attention in March only.
So please, let's add more playoff teams to guarantee college football will only matter in December. So people will only watch exclusively in December. Will be noteworthy only in December. It'll be great.