In all fairness, since Nintendo was making a profit selling the Wii hardware alone for $200US, (the $250US price is because they're adding $50US for Wii Sports; the Japanese versions without said game come out to ~$200US) even 3 years ago when the console came out, by now they're probably having a profit margin of over 50%. (as some have put it, "It prints money!")
Of course, demand for the console is high, even in a recession, so they've had little reason to drop their prices to boost sales. Of course, chances are that with the Xbox 360's price catching up, that they might be seeing sales slow down a little, and want to kick it back up.