Not just people with good averages, but more so people with lower averages who want to make them better.It may keep them from expressing counter-views that the orangey colored folks might, as a collective, down-mod and post ripostes which will encourage others to down-mod or not up-mod further.
Not implying that the orangey folks think as a herd, but it is possible that, by virtue of their prettier coloring, people will be more inclined to follow their lead, and think their opinion the more correct one.
Sure, it makes people less likely to post anything that goes against the desires of the group. This will impact inane and stupid and inflammatory things more than unpopular ideas. As long as they are phrased civilly, unpopular ideas usually do fine. It's just that very often people that know their ideas are unpopular go out of their way to antagonize the community.
Not implying that the orangey folks think as a herd, but it is possible that, by virtue of their prettier coloring, people will be more inclined to follow their lead, and think their opinion the more correct one.