The main problem I see is the mix of high level characters around at the moment.
For example; you may have a bunch of high level ebul people; they can't do Kanthea's because they would be, rightfully, shot in the face on the way there.
As for high level good people, there's not really that many of them and usually they're too busy dealing with other things - plots, helping out lower level guys, stuck in meetings in HQs, waiting for the ebul people to appear so they can shoot them in the face, etc.
Also not knowing about said quests is a bit of a hindrance. There may be a bunch of quests that a level 10 character can go on. But off the top of my head I can think of three (frost giants, Kantheas, bresk vampire).