I think this is probably true, and I have seen cases where e.g. Eliezer is highly upvoted for a certain comment, and some other person little or not at all for basically the same insight in a different case.
However, it also seems to me that their long comments do tend to be especially insightful in fact.
One story is that people are more willing to read long comments from Yvain or Eliezer because they have reputations for being insightful.
I think this is probably true, and I have seen cases where e.g. Eliezer is highly upvoted for a certain comment, and some other person little or not at all for basically the same insight in a different case.
However, it also seems to me that their long comments do tend to be especially insightful in fact.