I've often considered this.
What you want: Players to actually spread out role play
I think you're on to something, because I've often wondered if xp (I.e. The thing that puts one player higher than another in terms of ability/in game currency) is the right way to incentivize what you want, which is spreading out the role play. If you think about it from a certain perspective, this xp-for-HangingWithN00bs arrangement might spread out role play, but it may also be the very thing that results in Alpha roleplayers dominating the environment from the very people they're generating XP from.
One thing that I think is fair (though doesn't seem to work; I can only theorize why) is to incentivize the players who are welcoming and inclusive with leadership positions. The last thing you want is to hand a faction over to a player who only RPs with two of their friends and a close TS partner. No, you want people who are inclusive in those positions (faction heads, primogen, Lord or Lady, etc).
So it makes sense to me to say: "Hey, I know you want to be in charge ICly, but that comes at a price. You've got to show the game that you're gonna be welcoming and inclusive. The more you spread your RP around, the more you'll be incentivized with leadership. Then...you have to keep using that code that shows you're spreading your RP around to maintain it."
So, in the sense of "reward the behavior you want", this seems logical to me. You want to reward the spread of RP, and this option would reward inclusive RP with being at the forefront of the RP and further incentivize doing so.