Windy, you're either having a laugh or your airmanship is somewhere around that of the lowest common denominator.
RAS and RIS are services that are mutually agreed between pilots and controllers. These services are only applied if both parties can comply with the terms of the agreement. From a controller's persective, if he/she cannot provide an effective service then they will refuse to apply the service; there's nothing to be gained from 'leading the pilot up the garden path'. This is a decision made at the time, depending upon the general air traffic situation.
Talkdownman, are you really a controller?