After taking off my green tinted glasses, I still find that % surprising.
Well maybe not if you think that if 100% of everyone assumes miami will make it, that only leaves 1 spot up for grabs. If 100% of boston fans think they will make it, 80% of indy fans think they will make it, 70% of bulls fans think they will make it, 40% of knicks fans think they will make it, 70% of philly fans think they will make it, etc. (these are all presumed biased opinions)
In that case, I'm actually surprised that 45% clip is as high as it is. But if you ask only fans of western conference teams, I'd expect the % to be 45 or higher.