If you think that is the case, then perhaps you should run a test by downloading a Linux ISO image. I find that with those torrents there are always loads of seeds, and they don't limit your rate if you don't upload enough. I find on average with a linux ISO, I have to keep my client open for weeks after the torrent finishes to get a share ratio above 1, because there are so many other seeders out there doing the same.
If you want to run the test, here is the torrent URL of the latest Ubuntu release:
http://releases.ubuntu.com/maverick/...86.iso.torrent