Is there a particular reason you don't use a client such as uSerenity?
Because leeching hurts the BT community. You're taking from seeders without giving back; how is it fair? The least you could do is be courteous enough to seed while you download (if not seed to a 1:1 ratio).
I seed a lot for freeware applications, open source programs. For some reason since so many people seed it hardly caps my line My max upload was maybe 3Mbps where my main upload is 75Mbps. Do you know any files that need to be seeded?