while a lot of people are looking at it from the point of view that a "complete" controller costs 60usd, what they should realise is that nintendo is one of the only companies to offer the necessary add-ons, and bundle them in with games at no additional costs. (e.g. the microphone which came bundled with mario partys 6 and 7 and odama).
yes, the nunchuk "accessory" costs you 20usd, but the wii remote itself is priced at 40usd (just a bit more than a wavebird controller, while offering a bunch more in capabilities). remember too, that not all games require the nunchuk add-on (excite truck, warioware, etc...)
I have the feeling that we'll be seeing some pretty cool add-ons for the wii remote and you'll get at least one of them free with the games that support the remote add-on.