If AirBnB is going to get big, they need to have anti-discrimination policies. Without such policies, the states and federal government will sue them into oblivion--whether any laws were actually broken or not. Civil rights groups will boycott AirBnB and any TV network that carries their advertising. The list of hurts goes on and on.
So there is no future for hosts like you who want to vet people. Vetting allows too much room for all sorts of unsavory discrimination. More importantly for AirBnB though, vetting gets in the way of AirBnB making money and competing with hotel chains.
This company dreams of being the "Uber of hotels." You're in their way. You're like the old-timey Lyft driver who wanted people riding in front and doing the fist bump. That's over.
The sort of hosting you want to do is going to have to route through some informal mechanism, like an email list or word of mouth or some web forum, or maybe a random Facebook group. It's incompatible with a Bigcorp that wants to make money, lots of money.