If you're going to add another rarity tag toward one end of the Rarity spectrum, I think there needs to be another added to the opposite. I think just adding one between VR and OMGSR will unbalance everything, so you'll need to add another one to settle it out.Plus just haveing more rarity tags on one end just make them seem less and less valuable.
But all in all, I don't think we really need that. For one, if we do add it, I feel like it's going to be a short while until people start saying we should add another, to see which ones of that group are closer, and then they'll want another, and then another, and then we just end up with this whole mess of 30 different rarity tags and a long, confusing list of how to convert them.
And if we do that, well is a mess of a madhouse, really.
I think at this point, we are fine. My mind might change later, but I don't really see that big of a reason to change it at this time, especially with the rarity update. I'll come back in a year or two and see if my mind has changed for support.