A PvP player generally doesnt need to reach 30. I'm using "generally" as a small disclaimer for Iron banner but let's be honest here, a lvl 30 PvE hero shouldnt be a problem for a lvl 29 PvP warrior. Additionally it's not just about the Crucible vendor. It affects 4 out of (currently) 5 factions. But hey, if you want a bunch of people who hate PvP in your games.....