I think its a reasonable request to make of people.

It makes sense that the guilds would be more likely to reward people in the areas they're based.
Classes aren't discriminated against as the same restrictions are applied to all classes.
I think its fair to ask players to travel in order to obtain the rewards they want.
It means players are going to me more likely to start moving their characters to Gridania and Limsa Lominsa rather than everyone gathering in Ul'dah.