I just have a computer on my home network, which is also the media server.
That, my dear friend, is a seedbox, that you had to pay for, and whose continued uptime you have to pay for. It also reduces all the other upload you can do, which is also payment. So okay, maybe my "dedicated" was wrong, but still.
Apart from that...
Think about this logically. If people join private trackers and only upload/download from each other, what happens if one person has a ratio of 56?
It means that 55 people have to have a ratio of 0 or 77 people of 0.25, etc. So, people with such high ratios can only exist if there are others who become leechers. And "becoming a leecher" just means you relatively invest less in seeding than others.
Private trackers work only if you are in the top x% of seeders. The more "super-seeders" there are, the more you have to invest yourself, essentially artificially increasing the barrier of entry more and more.
It's just a very stupid system.