Our members will, obviously, gravitate to where other player's activity is. Considering the large difference in player activity between Dublin/Leeds and the other Bretonian systems, it's not surprising you see BAF in those two systems far more than any others. Not only that, but in lore those are the two systems we'd have the most operations in anyway. Leeds is the front line of an inter-house war and over half our active military is in that system holding off the Kusarians.
That said, give us something to do in the other systems and you'll see us out there too. Problem is the massive levels of pirates in Dublin pirating the massive levels of miners in Dublin leaves us outnumbered lawfuls with a busy schedule.