Some trackers solve this by having certain torrents not count towards your download, only towards upload. Usually older torrents, or those in need of being seed

Some trackers solve this by having certain torrents not count towards your download, only towards upload. Usually older torrents, or those in need of being seeded. This, coupled with other rules, such as that you need to seed a torrent at least X amount of time after finishing it, helps to maintain a healthy site.