I think most round badge kits are purchased by collectors, although some people do gig with them. I certainly would never consider dragging a $4000 or $5000, close to mint condition, RB set to a gig where I would probably be the only person to appreciate it.
I found a Gretsch round badge progressive jazz set in a pawn shop in Alamogordo, NM. It was in rough shape, but cleaned up well and now it is my gigging kit most of the time. Who knows what it is worth; prices have gone down on these sets since Steve Maxwell wrote an article about them being in the $6000 price range some ten years ago. Regardless, I like it, it sounds good, and I play it whenever I play out. I may be in the minority, but why have a kit you're afraid to play out?