This was one of SOE's few good ideas, ie: setting max level limits on certain encounters/zones. One of my complaints about WR is that it is a haven for high level campers. Case in point, as I progress I have regularly seen level 60 players walk into Blackburrow, Warrens and Shrouded Isle and clean the place the out for hours. This totally screws the players that could actually receive xp in these zones.
