short answer is there is no fix. theres an extremely valuable drop that isnt your piece, that everyone can use. no one is going to trust you to not be a dick. we all of had that ninja experience at some point, especially in the old days. As players, we are smarter now, and understand the risk of trusting or not trusting a stranger. Even a guild run i wouldnt trust you to not fuck off with the mount. its not hard to type /gquit and then go to trade and type /lfg a week later, or in hours where there is significantly less traffic in your current guild.