Well, I would hazard a guess that the town is dying. The note that the Doctor got from the greenhouse seemed to indicate that the people of this town will benefit greatly from us, but we- well, it seemed to imply something bad for us.

It's all to help themselves, with little concern for our free will. If I knew what they needed I might very well volunteer to help, but it's just been games and secrets. The 'why' is a very important question. I can't fight if I don't know what is truly going on.