It's all randomisation with the maps being picked. Though I've noticed a LOT of unpopular maps on the board, there isn't (that I know of, apart from praying) a way to change it.
Not that they don't want to, they have to set priorities. Considering scare was only gonna be there for like, 3 weeks, there must be some demand to play it ;)I think there is but the admins dont want to. I mean at halloween we had 9/10 signs populated with 'scare'