You know enough about gaming?? So I guess that makes you an Optometrist then, qualified to tell people medical information about the eyes?? You either have bad vision, or bad perception of motion. I can use fraps, and kick on recording at 30FPS while in a 40+FPS situation, and I can notice the difference immediately, even at only 10FPS difference above 30. The reason that sports on TV looks so much smoother in motion than the typical movie is cause they are filmed at a higher frame rate than the typical 24fps NTSC frame rate, and even non-gamers can tell the difference between those video sources. Once you start getting past 80+, the law of diminishing returns starts to really take effect, but still is better. I'd say around 100+ it becomes negligable to 98% of people, but that does not mean that no one out there has vision good enough to notice higher than that, even if I couldn't.
Finally, the game itself has a lot to do with what frame rate is reasonably playable. Turn based strategies don't need nearly the frame rate of games like burnout/tekken/COD/Dirt. Plus, if the game itself has very little motion most of the time (myst etc.), a high frame rate wouldn't matter or be noticeable most of the time either.
Finally, there are enough people who have made themselves clear about being able to notice differences in higher frame rates (30+). Don't go around talking crap and calling them, or myself, liars just to gratify your ego over your own genetic shortcomings. I can't do a backflip, does that mean I should go around saying others can't?