I mean honestly what where they thinking with the DS
Lots of Yens?
http://www.eurogamer.net/article.php?article_id=57356
The latest figures from Japan show that around half a million DS consoles were sold in the four days since launch, with estimates ranging from Nintendo's figure of 513,000 units sold through down to Media Create's estimate of 468,900 units.
Note that the link / article above is from 08/12/2004 so just guess much they have sold those now... I'd imagine that they are cheap to manufacture too because they are small and don't have HD or superhyper gfx-chips.