That's also the case with a lot of laser printers. Nice (more expensive) ones will just tell you toner is low while others will refuse to work. Toner cartridges usually have a window that the scanner will try to pass a beam through to determine toner levels. Problem is that this tends to be in the middle of the container. Again, dark tape fixes the problem.
Either way, I'm of the mind that the way to go is to buy a decent stand alone scanner and a basic laser printer for more people. If you need to do a fair bit of copying (~15 page a week), buy a scanner with a feeder. It'll take more steps to do copy jobs, but the printing itself will be faster with the laser printer and you won't use up ink so quickly. Plus, if you buy a stand alone scanner odds are it will be better and give you the open to make nice scans should you need it and will scan more quickly for normal scans.
I still have a color inkjet printer around, but that's become my specialty printer for single pages or the occasional art project. Most of my printing has been replaced by a lower-end laser printer that I picked up for $80. Given that I've printed probably ~200 pages with it in the past month, I say its been worth it.