I had thought that was already eliminated so thanks for pointing that out! I just pushed a fix to remove the AirBnb requirement.
As for more complex itineraries, certainly want to tackle that in the future...
I think that's smart. Honestly, the UI is nice and all, but I don't think that's the killer feature. The great thing here is that folks don't want to be an asshole to friends/family/coworkers. They don't want to nag about getting commitments or on-time payments. They don't want to be a jerk about not giving money back if someone bails the night before a trip, or whatever. But Villagers can be the asshole (in a good way!) and enforce the agreed-upon terms so the trip planner doesn't have to.