Blackdid:
As far as my understanding goes, the rules of jump-on are more "implied rules". Some staff may argue that we are a filesharing site, so really sharing files is the whole point of the mattter. Other staff may not view jump on seeders very kindly on a new upload. It would also depend on the nature of the jump on. I personally take a viewpoint of it's not a nice thing to jump on to seeding a new upload because it cheats the uploader of the full credit of the 1.000 ratio of the file. That being said however, I cannot say that my personal view is nescessarily that of this site. Perhaps mgr can shed some light on the subject at some point.
Either way, jump on seeders don't bother me because I have a seedbox (which I'm expanding), which maintains my ratio on an upward incline on its own giving me 12 SBP / day. I cannot say that it is fair to expect all users to have the same kind of setup for a variety of reasons. So really, that's kind of a subject that I'd like to see a a more even loosely described rule regarding jump on seeders.