Among 8 players there would be always 1 or 2 guys in a bad moon, therefore susceptible to leave or insult at the first mistake. 1 or 2 guys who queued up but don't really have enough time to finish it (oops ! dinner time) so they would leave too at the first mistake (or even cause the first mistake !). 2 or 3 guys who absolutely need to finish this instance in order to go on with the story quest, and, 2 or 3 guys in a good mood and will stay until someone click on "Give up".