I think that is a bad idea because it turns the site into a popularity contest. I think the mark of a good poster is one who can challenge the ideas of the original poster in a particular thread, while instituting their own ideas and opinions that either provoke thought or inspire readers to change their minds from the original poster's opinions. That can tend to cause tension in a thread, or among posters, if you're challenging or refuting a claim. That tension turns into a personal dislike the majority of the time, causing the person who is being refuted to personally "not like" the poster instead of trying to see the other side of the textual argument.
The person who can successfully do what's stated above, IMO, is a good poster, but at the same time probably isn't liked very well to most of the people who take disagreements as personal insults. That "good poster" would probably not make it into the popularity contest of "super membership" even though they probably deserve to be there. However, the person that doesn't really challenge ideas or arguments and doesn't offer much controversy or personal opinions of their own, and just simply agrees with everyone would gain a lot of votes or respect among members, and could easily gain admission into this "super membership" category.
A "super membership" category that is based on voting would just introduce a friends or ally category that would give members who are not included a negative disdain to the site. We already have posters mocking the "old boys club" of TBD, and I believe a voting system would just make that perception worse.