Multi-OS software

Shouldn't the storage capacity of DVDs allow for software to be released for multiple OSs, like Win/Mac/Linux, rather than having to occupy their own shelf in another box?  Like movie audio, all the needed data is there, but the user chooses to select which language.  You could use the same data/resource files and have an OS specific executable for the user's OS.    

>>1
They could, but they don't because they're stupid and like trouble (tech support costs)

>>4
Yeah, every bad thing on Earth is because of ebil capitalism.

I doubt more than 10 guys buy the same product for two different OSes.