Can you? What about these countless "0 seeders" rare materials which never start or stop forever at 90% mark?
If not found on any tracker, such a material is probably too rare for anyone to care about. Even with some monetization model in place, it would be unrealistic to keep all sorts of "rare" materials in the world to make $1 from a random stranger coming once a year.
Anyway, I would't pay $1
Also, there's the issue of people finding rare source materials, but keeping them to themselves, because sharing is a hassle. Monetization would help incentivize these people.
If you only download the popular fresh content like the latest Debian ISO or something like that, of course you never have problems.