worms everwhere and its sunday
certain game engines benefit from higher fps like cod series quake and so on.
you should aim for 60 fps really on pc. if you cant tell difference when playing between 60 and 30 uninstall
if i play cod4 for eg if i chose 30 , 60 , 125 , 250 i coud tell all of those quite easily.
Yeah, but you can tell the difference in lag between different length network cables. We don't all have those superhuman powers.

It all depends on the game for me (fps vs RPG for example). If it feels smooth and looks good, I don't care about the number of frames being rendered.