First thing that comes to my mind are random casual PvEers in blackrock mountain getting easily ganked by a PvP specced player who has spent last 5 hours grinding in order to collect 100 golds for this weeks respecs back and forth from PvE to PvP for both raiding and weekend PvP fun. Those kind of players should have advantage over players who are ''cba'' to respec or grind.
Just for clarification i am not that type of player, i roll both with standard sword PvE spec and a ''preparation'' rogue easily owns me.