According to the archives of that meeeting in Camp David Barak walked out after offering Arafat precisely nothing. It is all described in painful detail in Norman G Finkelstein's "Beyond Chutzpah". The Palestinians have never been in the position to offer anyone anything because Israel has had them under military rule for 40 bloody years. Are the diaspora really so damn stupid they can't see that very simple point. If you are confronted with a well armed theif and you have no gun who is in the position of making offers. Certainly not the man with no gun.
Shaffir to Herzog: Opposition failed to show leadership in political battles against PM (Haaretz)
from the article: A no-brainer for American Jews