Your 40 fps that looks good now will most likely look bad on a higher than 60hz display. You can try at this siteSo 60 Hz display is too slow for anything above 30 fps. I didn't know that but it makes sense.
I would consider upgrading my one, but it would bring me only trouble now. Movies need some interpolation processing to look good on fast display, games I'm playing (Wild Life, Hunt and Snare) do barely 40 fps at max setting so it would actually look worse, unless I reduce settings, so it would look worse in every case. My gaming times are long over, at least until I either retire or divorce
But if high frame rate makes such difference, why are movies still going with 24 fps?
You must be registered to see the links
to see if you notice a difference between 30 and 60 fps. There are a nice number of tests on there (the Black Frame Insertion one is very nice, to see how much a difference it can make).There are a lot of reasons and theories why movies are still 24 fps. People don't like the ultra realistic high frame rate for movies, it's tradition, it's (or used to be) way more expensive to capture in higher frame rates. I haven't done any research on this though, so take that with a grain of salt.