I love this idea and it seems like a great way to bring people together in real life through technology. Like others though I think this could have trouble with laws and probably to a greater extent than AirBnB. How liable is the host if there is an food poisoning incident for example? Is Cookening liable at all? Anyway, good luck, it's a great idea.
Kinda sad that the first thing we have to worry about is how we could possibly be sued while having strangers over.
This is not really some sort of altruistic dinner club.