Well, I don't want to get off the point of the thread, but the human eye can see over 60 FPS. This all has to do with the amount of light/colors on the retina as well. The reason films are 24 FPS is because it's a tolerable amount. Plus the films reels would be 2 to 3 times as large and cost 2 to 3 times as much to produce. The easiest way to prove this is the fact that you can see dust and bemishes on a single frame during a movie. If the film reel was moving faster then the eye could capture that, then you would not be able to see it. Also one of the reasons the movie theatre is so dark is to help improve the FPS. Being in a dark environment with a bright movie helps burn the image on to your retina much more efficiently giving the effect of a much smoother image. This is called an after image. If you were watch the same movie in the same theatre with all the lights on, then the FPS would have to be increased to obtain the same quality.

The newer digital cameras will be playing at around 60 FPS very soon and some of them are already out there are recording and playing at that rate.

This is discussion of frames per second and video games has been going on for a long time, well before these sims came out. Most experts and gamers would agree that anything over 72 FPS is overkill. However having that buffer up and over that number is always nice to have when you add more smoke and scenery. This is also why most monitor have a refresh rate of up to 60-80 Hz (= 60-80 FPS). You have to take that into consideration as well when you are tweaking your games.