No, it would not be worth it to hunt with 8 people. you would not get more exp, because it is for each unique vocation, so you get the best xp with 4 people of different vocs, and you start to lose xp per kill after this point. so even in somewhere like prison you would be doing a very efficient hunt, but would not get much exp. you are still better off hunting with just 4 people of 4 unique vocations. hope this is what was asked.