I've been noticing this as well.  I was thinking that it had more to do with the  :police: and DMCA takedown requests, not as much as being a dupe.

Although the ones I have really noticed are probably because somebody upped a whole bunch of vids from a particular site, which while nice, I'm not about to download 16GB or whatever it is, especially when I've already downloaded a bunch, and it's easier to download singles, not whole collections.  So while technically a dupe, I'd probably allow it.

I try to go for a 200% upload, although sometimes I find myself deleting the .torrents after they hit 100% or above, especially if they've been languishing for awhile, although if I'm the only one or two seeding, I try to keep those going as well.

Oh well.  I'm not in TB range (yet), but with 6000 seed bonus, a 2.6+ ratio, I'm not going to worry about the discontinued torrents affecting my ratio.