Well, say you run a blog.. and have 10.000 visitors a day.
Combined they make 3000 downloads (as not every visitor downloads)
Fileserve 1000
Filesonic 1000
Hotfile 1000
Then you add Duckload, and it'll become
Fileserve 800
Filesonic 800
Hotfile 800
Duckload 400
Overall loss, but more traffic usage.
Cause Duckload will 'steal' downloads from the other ones, cause they do count all IP's
Combined they make 3000 downloads (as not every visitor downloads)
Fileserve 1000
Filesonic 1000
Hotfile 1000
Then you add Duckload, and it'll become
Fileserve 800
Filesonic 800
Hotfile 800
Duckload 400
Overall loss, but more traffic usage.
Cause Duckload will 'steal' downloads from the other ones, cause they do count all IP's