Because more the seeding faster the file downloading or fast sharing. Explanation: Firstly, SEEDERS: The one who uploads the file to the torrent site. LEECHERS: The one who downloads file from the torrent site. If someone uploaded a torrent to a site with the seeds at 100kbps and if there are 10 leechers then each leecher is approximately getting the file at 10kbps. After each 10 people finish downloading the torrent from the uploader and are seeding at a speed of 100kbps. Then the total speed of the torrent after the 10 get done downloading and seeding the file is 1100kbps. Because 10 are seeding at 100kbps and the original uploader is seeding at 100kbps. Now if there are 11 more leechers getting the file then each of those leechers are approximately getting the file at 100kbps instead of 10kbps because there is a 1 to 1 ratio per seeder & leecher. So if everyone just downloaded the file and stopped without seeding the torrent 1:1 then the speed of the torrent wil