User blog comment:Darkcloud1111/Good Idea, Bad Idea~Mountain Glenn/@comment-5217560-20141013022054/@comment-4010415-20141013044352

Hmmmmm... "The southeast quadrant of Vale is known for wild forests and deep caves!"

Deep caves - Perhaps they found the deep caves to be alluring because it would be a good place to mine for dust.

Wild forests - Definitely a good reason not to build there, due to how many grimm could be living in those wild forests.