Southern Miss has been a complete dumpster fire, the last few years, and shows no sign of putting the fire out. They have no money, to the point they were looking to drop BYU from their schedule because they want/need to schedule a body bag game against a team like LSU or Bama (local that will pay lots of money). They are the easiest of our gimmies on the 2015 schedule.
I'm sure they idea is to push them back a few years and play a slightly better team at home -- you can't get much of a worse team and still have them be FBS, many FCS schools would be an upgrade.