I guess the problem is that the hunts really were meant for solo players to kill Bs, groups to kill As, and several groups to kill Ss. Instead, players decided that the whole server would kill every hunt mob to maximize rewards. The developers simply don't understand human nature I guess, it's natural to want the most rewards for the least effort especially in MMOs which have time sinking as a fundamental part of their design.
that's why i generally pull Bs and As on sight. the only reason i'll wait is if i don't think there are enough people to kill it, but most of the time there are enough people by the time i get there.