Bcuz you do always have a warlock in your group. You don't knwow hat is slow killin when you are a warlock. I just have to find a priest or a druid and a fihter and I am sure to make good exp. But when I am playing on my paladin alt. I can be stuck with no wiz/warlock and the killing is often slower for slower exp sniff sniff. Well at least. When I am on my Pally I am sure to have a good tank and good secondary healer in my group
