It's fairly uncontroversial that the success of decentralized protocols can promote - and sometimes, even rely upon - centralized points of engagement.
But your experiences sound like what goes on in the public trackers. It's reasonable that folks who go to Pirate Bay to get their TV shows are not going to be as engaged as those who go to TVV, MS, or MTV. There's also the security risks of letting untrusted users upload files that may get consumed by thousands of people in the first hour.
In private trackers, I have often found that uploading is encouraged, going so far as to provide very detailed guides in their wikis showing how to rip the media, prepare the torrent, and upload it to the tracker. If a better quality version can be uploaded to trump the previous version, that is also encouraged. Learning, quality, and appreciation are cornerstones of the private tracker ecosystem, in my experience.