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xkcd #2846: Daylight Saving Choice
(imgs.xkcd.com)
Alt text:
I average out the spring and fall changes and just set my clocks 39 minutes ahead year-round.
International travel would be way more confusing.
If I land somewhere at 9am local time I know that the bank will be open when I land and it will be day time.
If everyone is on the same time and I travel somewhere it will be a complete surprise (or I will have to figure it out before hand) whether or not it will be the middle of the night or the middle of the day.
But who cares? Everything would be open 8am-5pm GMT regardless if it's sunny or dark outside. Go visit the Grand Canyon at midnight, it's the same as at sunrise or at noon!
No it wouldn't, generally it's healthier for humans to sleep at night, so businesses are going to trend towards operating during sunlight hours.