No oracle what you have done is essentially killed a portion of the game that a contingent of your customers enjoy. By pandering to some you have alienated others. Time will tell if it was the proper business decision or not. Unless the rival list opens up to include all level 250s I think you will be seeing many more inactive high level accounts. Can't speak if the rival list is the same for lower levels but my list is predominantly made up of accounts with over a billion attack that I can't touch.