Whatever the reason, I'm happy they do lol. The LNs are fantastic and I'd of gone mad without them fulfilling the Spice and Wolf fix that the anime left me craving.
I hope they're trolling, but apparently Cthuku isn't subbing quartet anymore.
http://cthuko.nyaa.eu/2013/12/21/disbanding/#comments
That would seriously suck. I heard Watashuki (sp?) might be picking it up, but I don't know how credible that is. I know it's free and they don't have to do it, but if their reason for quitting is true, it's lame of them to stop with only 2 episodes left. I wouldn't care if there were other groups subbing it, but they're the only ones.
Hopefully this is them trolling.