Regardless of any debate whether Iaijutsu is a good technique:
P108: Iaijutsu Opportunities
Quote**: After performing this action, you may sheathe one readied weapon
P98: Martial Skills
QuoteAny *+: You may sheathe one of your readied weapons per * spent this way
I get that re-sheathing the weapon is more useful to an Iaijutsu practitioner, but you're giving him an opportunity which he already has and charging him at twice the cost , and since it's *+, it's not like he even has the chance to sheath both weapons for *** when a normal samurai could only sheath one.