it seems that positions works as following:
1. people figure out how bank method works and get more or less back what they put in, most likely less
2. plarium change positions so they more "fun"
3. players figure another way to do them, get more or less same troops as they have put in and ...story repeats.
good for these who found bug and multiplied armies
bad for rest of players who seems to be at negative all the time