I kinda do agree controller prices are too high. Seriously, I think it is completely possible to make the same quality controller at a good profit margin at 29.99 a classic controller and 39.99 for a full Wiimote nunchuk controller.
And you say, that it won't help people decide what system to buy, but people add up the price of individual accessories all the time. They know exactly what it costs to play the games with friends. And this is vitally important for Nintendo, because they are trying to sell their system on the asymmetric gaming. Which means to play it proper you need that multiplayer experience.