The thing is, that Nintendo has no reason to drop those prices. When titles are still selling at $50 a pop, why lower them? You only lower the price if you make more profit that way. Since the cost of making each disc and case combo is so low if Nintendo sold 100 copies at $50 they'd make $5,000. Suppose they lower the price to $30 and sell 150 copies. They sold more copies but only made $4,500. At that point it makes more business sense to leave the price at $50.
Nintendo does lower the price on some games (Metroid Other M comes to mind) but I really wish there was a Player's Choice line for the Wii.