Please don’t fall into ad hominems. Focus on the discussion not the people.
I don’t need an example. I’m well aware that people cheated like that, and Blizzard in no way supported it. But that’s not a reason to add guild banks. Its a reason to ban people who did or will do that.
And WoW has no real world monetary equivalent to one event.
You’re still hung up on thieves and abuse, which in the Vanilla environment, was treated with “You shouldn’t have given them your stuff if you didn’t trust them.” “Guild storage” was not used in the same way guild banks are today simply because of the reason that they are a trust concept. You don’t put all your fish in, knowing you’ll get them back. You bring your fish to the raid and hand them out if you want them.
Guild storage (in sensible guilds) was only used for guild items, like Corehound Leather and Fiery Cores, or Onyxia Scales and Cloaks. Things that the guild created as a group, and the Officer in charge of storage was entrusted to manage.
Anyone who needs to cheat to manage their guild’s stores is simply doing it wrong. That’s not a reason to break the Vanilla meta with a TBC concept.