Honestly, RP's between two people or a group of several people are usually the way to go these days and I have always found them to be the most fruitful because all parties are interested in trying to create something fun and interesting.
Save your RP energy for those meetings between conspirators, relationships between liege and vassal, close friends reminiscing over old the days, etc. Generic RP's sent out to the whole realm will probably never be a productive or engaging as ones between cooperative and willing parties.
