As you all know, Wii Play has managed to become possibly the most successful non-pack-in game for the Wii, and you all know the reason why that is, don't you? I'll give you a hint: it isn't because Wii Play is such an awesome game.
So yeah, millions of people have bought Wii Play just for the fact it includes a Wii-mote in the box with it. Nintendo has successfully followed this strategy with Link's crossbow game which has sold well just be including a cheap plastic shell with the game, and they are about to do the same with Mario Kart by including yet another plastic add on to help sell the game along.
The one obvious thing which is missing here is the Nunchuk. It isn't packed in with any game, and in order to get it you must purchase it separately. This is such a waste,because Nintendo could make any crappy game idea they wanted into a huge financial success if they chucked it into a box with a bonus nunchuk. So why aren't they doing this? They can throw together some cheap shovelware titled "Link's Lawnmowing Training", or "Samus Aran's Bowling Training" and shove it into a box with a bonus nunchuck and put a $50 price tag on it and that game would sell in the millions.
So why isn't Nintendo doing this? If they did think of the profit they would make by combining a $20 nunchuck with a $5 game and charging $50 for both. Plus it would put more nunchuks into circulation and further the success of multiplayer Wii games in the future.