And you have made the twist really entertaining. (For the person who knows, of course. ;) )
I can only repeat what others said, but it is also very easy to include into a setting... and adapt. It needs not be tea, take coffee from the mythical kingdom in the south, or let's say a fungus the dwarwes below eat to become so strong and hard (and there are bodybuilder types who would pay a lot to get it).
Ah, a scam, with snobs being the victims. Meh likes.
Now, imagine further layers of conspiracy: perhaps Elves sell their tea as human-made, but with special effects: reducing the agressiveness and fecundity of humans who drink it, thus making them pose a far lesser threat...
There could be villages of fake elves to promote the image of elven-made products, while elves could hide in disguise (as humans) to raise far less curiosity and suspicion than if they were in the open. Go to Comment
Its simple and complex all at the same time. This could go anywhere from a simple side meeting to an actual full blown plot with many of adventures to take place because of this fabled tea.
Perhaps down where the tea is made there are problems, bandits or a small army takes up residence where the tea leave farms are located and shipments cease. fear of letting anyone know their ruse the Guild stalls saying the borders are closed ot the elven lands but nobility takes an initiative and hires the players to go to the elven lands to ask them personally. When they arrive however they are met with incredulous stares and the real truth is discovered.
Oh no for the Guild, but will the players take a pay out form the guild to keep quiet? Or reveal the truth and cause a city uproar that could possibly lead to violence and riots? Would the nobles stop the violence if it was only directed at the guild responsible? The players are invited back to resolve the issue again. Go to Comment