Negotiating with people without values

I am involved now in a big multi-party negotiation. There is nothing more frustrating than negotiating with people without values. It is much worse than people without authority. I have both kind of parties in my negotiation. Most of these people do not like setting ground rules (Italians grrr). I am inches away from walking away simply because of values. My BATNA is scarily low, but hey those negotiation instructors in INSEAD need to learn a thing or two about assigning scores in the BATNA value for human pride and values.