My understanding (having been there and heard from a page firsthand) is that OCA tickets for Price are treated as standby tickets--which means that ticket holders with official CBS tickets get priority when it comes to admission/seating. Once they're in, THEN the OCA people are let in.
I've been under the impression that OCA and other 3rd party tickets are "guaranteed" nowadays, but you get the worst seating possible (behind the announcer's podium, way in the back, etc.), while CBS tickets get the best seating possible, but they're not necessarily guaranteed.