Quote Originally Posted by andrewt View Post
I use them to increase the tax rate on my richest provinces.
That's essentially all I do with my Metsuke, if I can't recruit them from a province with philosophical tradition (+1 or more experience level) I send them wandering around bribing and apprehending until they gain a rank and retainer. Though just having them in castles "overseeing" slowly gives them exp, it's so little you probably won't reach 3 star level starting from 1 even during an entire game.
stationing Metsukes in provinces with gold mines + market really brings in the money.