that varies wildly by the nature of the set-up, i think.

if rules are set ahead of time and everyone involved plays by the rules then it's all good. but that's the same issue no matter how many ppl are involved. i guess w/more ppl there's more chance for the rules to be broken. again - set up can address that. ppl who are known to be likely to violate can be disinvited.

anyway, i wouldn't necessarily decline to engage in a gb just b/c i fear som'n could go sideways. it would depend on how much i trust the other folks. i wouldn't engage in it w/ppl i distrust - no matter which role(s) i planned to take on during the event.