drumsgreg,
When I bought my Treo Ct's a few years ago, RV told me a pair of those carbon tweeters were $1400 per pair. At the time, he was making those tweeters himself, by hand. Said he could make one pair a day. Also consider that the VLR cabinet has to be built with the same type of inside/outside cabinet of the Quattro CT and Treo CT. Which translates into a lot of work and attention to detail for the VLR's. This type of cabinet suppresses cabinet resonances to the extent that the 2 Ce sig. 2 and 3A sigs cannot, hence the reason the carbon tweeter isn't used in these speakers. The carbon tweeter would almost be wasted in them for this very reason, and THAT is why you will not see it in either of these floor standers.
Cheers,
Tim