No mid-level content substantial enough to hold its own community around it, nothing fresh being introduced around there too. All the earlier twinking communities are self-evident as with those who chose to stay at the pre-56 cap. Some games have several types of repetitive party quests or guild quests, which can't be played once u go above certain levels, as incentives to even out the level distribution. Those help keep those pockets of communities around, in those awkward level ranges of past level caps.