Playing the raid to get 3 rolls a week for one character type is not exploiting the RNG system. Is a guy that buys 10 power ball lottery tickets exploiting that system? No. They are increasing thwir chances of winning by buying more tickets. They paied money for those tickets. A player with three hunters is still playing the raid 3 times (are they cheesing the encounters? Cant say but that is a separate issue that is nit affected by having 3 of the same toon.) Boom. Blew you away !