dt :
i always wanted to know why people like highframerates when the human eye can't see over 30 frames per second.
im not sure if i placed this topic in the right forum but oh well.
This is a common misconception.
What you are talking about is, a fluid sense of motion. Indeed only 30 fps (in fact its even closer to 24 fps) is enough to provide the effect of fluid motion.
However, playing a game is not just about having the sense of fluid motion, it is also about the sensitivity of your eyes, and about how fast you can respond to what you see (mouse interaction, etc).
I read somewhere that when the army tested the eye sensitivity of fighter jet pilots, some of them could detect a target with the speed equivalent of over 250 fps, meaning if you really had a sensory system working at a processing speed of 30 fps, then this pilot would have spotted an enemy target over 8 times as fast as you, and even with equal reaction speed (physically responding to the detection) would be ahead of you all the time.
That is why most people prefer their games on higher framerates. I don't "feel" a lot of difference when framerates go over a 100 and I can decently play a game at 60.
Executive summary: a constant 30 is enough to get the impression of fluid motion but your eyes can process much higher framerates. Framerates that are higher than what you can actually process (detection but also responding) are useless to you in terms of gaming. Processing power of the brain varies (substantially) between individuals.