I actually like Gallia. I like the lore and everything. It's just...it's so far away from the other main houses. Maybe if it was a bit closer to Liberty, which is by far the most popular part of the Sirius Sector, people would be inclined to go explore it.
I guess it's not that far from Bretonia or Kusari, but it is extremely far from Liberty and Rheinland.
Also, Gallia is hostile to most other factions. If somebody from a Liberty corporation wants to go explore Gallia in their Stork or whatever, they're going to die right away.
When you're in Gallia, you feel way too secluded from the other factions in Sirius.