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At 1000 yards your target may even move slightly from the report of your rifle and spoil the shot, then what? .
The speed of sound travels on average depending on air temp a constant speed of 1,000 to 1,100fps.. It takes almost 3 seconds for the rifle report to make it 1,000 yards.. Depending on the caliber and bullet speed it's takes less than 1.5 seconds for the bullet to travel that distance.. Giving meaning to the term "Dead before ya hear the shot"
As far as why people want to take an animal at 1,000 yards.. Well everyone gets there kicks a different way.. Yours might be stalking.. I personally would rather send a bullet the extra 700 yards than have to walk it..