It helped me, looking for a torrent of an ebook that had no seeders.

It's very helpful actually. Consider the average torrent forum member who posts once or twice, some material that is both rare and not in demand. So he posts on a couple of forums, and sees no interest or very little, then decides to stop seeding.

This basically helps you reconstruct the torrent if some of the leechers have different bits from the different trackers, adding up to the full 100%.

Or at least, that's my assumption. It did pull together something for me I'd been trying to get for three months now, so reps to the TS.