Is there currently a Merchant's Guild?

What I mean by that is, is there a Guild that is (mostly) full of members who know how to work the market and turn a profit, and as a whole are easily capable of influencing the prices of items, with a dedication to doing boss runs and farming certain monster types for rare items and things of that nature

And if not, would anybody be interested in organizing or helping to organize such a guild? It would require more organization than the average guild, considering the dedication to the game market that the members would have to have.