I am kind of a fanatic when it comes to weight. I often take a scale with me when I go to shows, because makers tend not to know how much their knives weigh. 4 oz. is my EDC limit, and I prefer less. A lot of times the big beefy folders are just overweight, because the extra beef is in a place that is not going to break anyway.
I don't know why more makers don't emphasize weight reduction. Long ago makers started using titanium(I think Bob T may have been the first) because of it's strength/weight properties, but somewhere along the line, the original reason for using ti was forgotten. I have a Brad Duncan 'Misfit' framelock with a decent-sized blade (3.25") that weighs just 3.2 oz. Why don't other makers do this?
An extra .5 oz. might not seem like much, but if you add up the weight of your knife, light, keys, phone, etc., you might be suprised at how much you're lugging around.