None of this sounds like it addresses the underlying problem: you're relying on them to vet the guest yet you're the one with the most to lose if they get it wrong.
Well, yes and no. For the sake of argument, let's accept that AirBnb is worth $1.3 billion dollars. I can only imagine that a large portion of that valuation is based on the potential upside that would come with becoming a consumer success and disrupting the hotel industry etc etc etc.
What portion of that valuation will disappear if the perception that AirBnb "isn't safe" takes hold? To make the math easier, let's guess 10% (although it's potentially 100%). 1.3 billion / 10 is 130 million dollars, which is probably much more than the value of the stuff in your house. All of which is a long way of saying that AirBnb is actually heavily incentivized to get this right.
