Eh, using current members to test is a smart move. I'd be willing to bet that 80% of the players stayed around because of A Realm Reborn. Letting them test the game that enticed them to stick around makes more sense than just letting total strangers test it, as they won't have a ground to base their feedback off of. Current players know how the game works, and can give proper analysis on stuff like UI responsiveness, battle mechanics, etc.