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The last post makes the point well. The peripheral vision of eye (rods) is MUCH more sensitive to large area flicker than the central zone (cones). You sit much close to a computer monitor than a TV so it subtends a much larger angle. Hence flicker is much more noticeable. That's why 60Hz on a TV is usually OK but is truly horrible on a computer monitor.
You can argue that 50Hz and 60z are not OK for HDTV because they subtend a larger angle than SDTV when used at the intended viewing distance. LCD displays inherently have no large area flicker. Other types such as plasma might well benefit from up conversion to 100/120Hz.
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