experience. Admittedly, I've missed some of the P12 venues that some folks have complained about (e.g. Arizona), but by and large I'm pretty happy with the way we get treated. I will say I thought the Michigan State fans were particularly nice to me, especially since they were watching their season circle the drain a year after making the playoffs.
Everyone's experience is dependent on their 'micro-environment' I suppose, so we/I can't generalize what happened to me across an entire fan base.