I think one pool should not mine on another pool. If ghash.io give more reward now is to attract new clients, not to give proffit to other pools.  It is like I make a new business, I give free drinks and food for new clients, and someone comes, take all food and go to sell it to take profit.
   Imagine now clevermining has a perfect scrypt and makes a lot of money, then wafflepool mine there to get that profit.

         Not all is about to get any profit in any way.  We should keep some moral rules.