[quote name='Grave_Addiction']I don't look at percentages so much as I do dollar figures. When it launched it was $100 cheaper than the PS2 or Xbox. At the time, that was a big deal for people who don't have the cash to throw down $300. Today though, the system is only $50 cheaper than the Xbox or PS2, so the incentive to take the Cube over the Xbox or PS2 isn't as great because you get way more by spending the extra $50 on an Xbox or PS2.
Also, I don't think it would necessarily be a wise decision to try to sell too many extra controllers. Once or twice is cool, but having to spend extra money and buy another controller several times could wear thin pretty quickly with gamers.
Although, like you mentioned, if they could get third parties to start producing software for those extra controllers, Nintendo could be on to something.
But I just think it might be too much to buy an extra controller or four extra controllers just to play one Nintendo game.[/QUOTE]
The percentages matter. Put yourself in the mindset of someone who nevers buys at or near launch. Only a small fraction of the eventual installed based is moved in the first year due to price and manufacturing capacity. If you're a person who doesn't even consider a new console until the price is $150 or lower, $50 bucks is serious chunk of change.
It's also been a saving grace of the GameCube. More than either other machine this generation, it is most likely to be a secondary system on the basis of its exclusive titles. The lower price point aided that and kept the situation from being even worse.