I like it. Good points for filling in a category. I like the idea and how it would be applied.
Yes it is background material. But that is not only okay, it is a great thing to post. The community has a mark propensity to produce Big Things that would define the setting should they be included. That means you can really only use "one". We should be producing little things; things just outside the dramatic spotlight. These submissions add an instant level of detail to the game for those who utilize them. Thus the GM could use dozens of the lesser things to fill elements of their world in. Go to Comment
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
The runoff from Mount "Evil Volcano" has turned an area of small lakes below into a vision of hell. The mixture of acids in the lakes is of such strength that virtually any organic material touching is quickly dissolved. It is a melange of sulfuric, nitric and hydrochloric acids.
However, the place does harbor life, and its very strange, and very dangerous....