Tried this even before you suggest. Does not work with your sample result 
It's not a one off thing, nor the only thing, but definately important in my view. Some people try this for a month, see no success and stop doing it. In my opinion this is a crucial part of keeping the realm lively, although it can never be the only part obviously
In the end you'll have to see what kind of nobles you have, who you have and adjust to that and get them involved somehow. Which realm are you talking about atm? I can't imagine for instance that it's Nivemus cause that should be pretty active I'd imagine?
