I just saw the thread that @Plveuk had posted about how to avoid getting scammed for dungeons. I’d say unless this idea gets implemented that the best idea is refuse to pay outside.
What I’m thinking (my friend thought of this) is that keys should be tradable, BUT as soon as they are traded, the key is consumed. So what would happen is the payer could accept the trade when he is ready, and the opener doesn’t have to worry about being scammed either. And then this gets rid of the “are you ready yet” crap.
RANT
I got scammed for an encore once because this group of EU server fags had another person who wasn’t in their guild “crash” the dungeon, and refuse to pay because it was my fault that he got in. (I know this because that person was in the guild after the dungeon). Its their fucking fault if they aren’t paying attention to who is inside the goddamn bazaar. They even had the nerve to invite me back to prove they weren’t scammers.
TL;DR
Keys are tradeable but they open as soon as the trade has been accepted by both parties.