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One reason is the licensing. You'd effectively have to allow anyone to use your eyes free of charge for anything they want, including multi-million dollar film projects. That doesn't seem right to me. You could of course say the same thing about Antonia, but that's a different story. No one would use a canned character for any big project, but technology to create realistic eyes would definitely be much sought for. Even if your version is made for Poser, people can still study your material settings and recreate those in other software.

I don't think it really matters much though, Just like most people wouldn't use a "canned character" for any major production, Poser's render engine and animation tools really aren't up to the task either. It may be fine for pre visualization, and many people use Poser for that, but when it comes to heavy duty animation and rigging and rendering, Poser falls far short. And while these eyes may be rather high tech and innovative for the Poser world, it's nothing that experienced people can't easily reproduce with mental ray, for example.
That's going to sound like a dig at Poser, but I don't mean it that way. The simple fact of it is, while Poser tech types might find it an interesting challenge to achieve such things in Poser, studios don't have the time for it, and it's a whole lot easier to use the geometry in a more capable app like Maya, which definitley has the lion's share of studio usage due to it's amazing animation tools, render engine, and distributed rendering.
As it is, animation capabilities aside, until Poser's raytracing gets considerably faster, I don't think it would be used much by casual hobbyists either, aside from in still imagery.