Certainly some custom support for the AMA would be nice, like getting cleanly summarized final outputs and highlighting direct conversation with the askee, and making it easy to find highly upvoted non-answered questions.
Very doubtful she'd work for free, so that rules out owners that can't afford at least a full-time salary.
Find someone willing to risk ~$50-100K just on the IAmA coordinator alone (who may not be able to attract celebrity talent to an unknown site), on the hope their site displaces Reddit (a very slim chance), and that they'll somehow then magically make it all profitable without chasing everyone off, and it's doable.
edit: I previously said Voat was a reddit fork, that wasn't correct.
Voat mimics Reddit functionally, but I don't think it's a fork