Apple does (or did) make speakers, or i should say they make enclosures for HK speakers. They used to make printers, which, aside from the Laserwriters, were kind of flops. I think they wound up costing too much money. Scanners aren't a good market anymore, it's kind of niche... They may have made one at some point, I don't remember...
Basically, without the historical perspective, they don't make these things because 3rd party vendors can make them better and cheaper, leaving the market pretty well solid...
paul