Priest choose to separate themselves from the material world of prestige and such for the quite insane reason of preaching salvation and whatnot to the unwashed rabble. While the noble members of the religion *might* see merit in that, they would still think the priest was rather odd in most cases. Perhaps there are actions other then preaching that should provide a chance of prestige gain, but then like I said it appears the priest game is supposed to be separate from the prestige/honour system in most cases.