I think that they make the exp too low is right
Someone may be farm all day in this CBT and they would get hight level than another but if the exp rate is low they only can get 30-40( the usualy level in alpha). I think if someone in this CB farm all day and get too much hight level(in normal exp) they will find that they have nothing to explore in OB . The game will get boring and unfair for newbie
(Sorry for my E)