Yeah, but we don't print a ton of color pics/documents.
And with the CYMK cartridges full of dry powdered polymer, not wet ink, they tend to last a long time just sitting there, even when opened and installed in the printer. Several years maybe if it's a design where the toner to transfer roller interface is relatively "tight", and your house or even your region/state is relatively dry.
Either way, it lasts a hell of a lot longer than ink. And there's no combination of colors when you print black, like some of the ink-jets that add the CYM into the black print to "help" you use the ink faster.
![Tongue :P](http://www.armedpolitesociety.com/Smileys/default/tongue.gif)
Also, if there's kids involved, you can put your foot down and make it the rule that anything they want to print, it has to be black line-art, and if they want color, they can fill it in with crayon.
When it's laser, the cents-per-page even makes color shooting targets pretty economical.
![grin =D](http://www.armedpolitesociety.com/Smileys/default/grin.gif)