If I recall my Leves correctly, I believe there actually is mention of a Baert Company in North Thanalan, so at least you're not without precedent with this idea. Plus, I think that description can also describe plenty of factions in Ul'dah. Most of the factions in Ul'dah, really. 
Playing the antagonist is always a dangerous game, but plenty of folks seem to have done it without too much trouble both in the game itself and here on the forums. I suppose the only thing I would want to ask is how consistent will the antagonism be and at what level? Will it be the more Ul'dahn - I keep using the Jewel as a point of reference, it seems - "puppet master" sort of deal with a lot of untraceable shady dealings... or is this going to be a bit more of a blatant "Yeah, these are bad guys" thing?
I think defining that will help define what folks might be interested in it, either as a part of it or acting in defiance of it.
Playing the antagonist is always a dangerous game, but plenty of folks seem to have done it without too much trouble both in the game itself and here on the forums. I suppose the only thing I would want to ask is how consistent will the antagonism be and at what level? Will it be the more Ul'dahn - I keep using the Jewel as a point of reference, it seems - "puppet master" sort of deal with a lot of untraceable shady dealings... or is this going to be a bit more of a blatant "Yeah, these are bad guys" thing?
I think defining that will help define what folks might be interested in it, either as a part of it or acting in defiance of it.
