Mercanes and Witchwyrds - how do they relate?

[Dreaming Psion]

So I'm wondering how mercanes and witchwyrds relate to each other, given they have roughly the same niche (LN alien merchants from beyond). Do you think they'd try to undermine each other as trade rivals?

[jabberwoky]

If you want to play them against each other, it seems quite logical: Mercanes are blue-robed, Witchwyrds are red-robed. Has a nice thematic ring to it.