Ultimately, the EyeToy was never intended to be used for any purposes besides the ones the software the peripheral was packed in with needed it to do. It followed a very different design philosophy from the Wii Remote (which was designed to be usable in many contexts) or the Balance Board (which was designed to be very functional in a more limited set of contexts). This has a significant impact on how many people will develop for a device, and of course it's software that drives hardware sales.
Sky Render - Sanity is for the weak.