I always wondered about that bracketed # myself, thanks.
As far as that pattern goes, I'm pretty sure that happens when someone is seeding with the "initial seeding" setting checked - the same as superseeding.
"A super seed will usually upload fewer bits before downloaders begin to complete than a standard seed by strictly limiting the uploading of duplicate pieces. That does not necessarily mean that the uploading will take less time. The time it takes for the first completion of a downloader when super seeding becomes limited by the upload rate of the peers connected to it. Further, the seed does not have global information about piece distribution and may not be informed of a piece being uploaded because it was uploaded to a peer not connected to the seed. That is particularly a problem if the seed cannot accept incoming connections. If many seeds on a mature torrent are using super seed mode, the performance of the torrent will be limited.
Super seed mode is most useful for seeds that pay for upload bandwidth by the byte. In that case, super seeding makes sense as it minimizes the costs required to seed a torrent. In other cases, the benefits of super seeding are not so clear. The configuration of peers and their individual upload capacities over the spectrum of individual torrents varies wildly. Seeding strategy and detecting at download time when a given strategy is most appropriate is a promising area of research.
The overall positive effect is not reserved only for the initial seeder, however, since the method creates multiple seeds in a more efficient manner than "average" seeding in a limited number of cases (one seeder, multiple incomplete peers). In practice, once the initial seeder uploads one complete copy of the file, multiple new seeds will emerge in a matter of minutes, thus boosting the overall uploading speed of the swarm."
I see the sense in this, as it does create a lot of seeds at once (ever had it happen when there's a bunch of you stuck around 95%? Superseeding.) But I get pissed, too, because at my download potential I can get the whole file then upload to a 2 ratio in less than half the time otherwise. It's like I'm being throttled. However, now that I've been cut off by my ISP 3 time for exceeding my bandwidth cap, I may use it myself in the future...