I know that private trackers require users to maintain a good seed ratio. How exactly does that work out mathematically? If a bunch of users have seed ratios above 1, does that mean that there are some users who will forever be below 1, and thus end up getting kicked out, thus resulting in the private tracker just… shrinking over time?
You seem to be talking about a completely different thing than the comment you replied to. The commenter above was talking about long-term seeding being incentivized by the tracker (it helps with keeping torrents alive). While you seem to be talking about short-term seeding. A month is not a long time.
Not every tracker gives bonus points (aka BON aka karma) the same way. I advise you look for one that fits your needs and use it instead of the one you’re complaining about. (Some examples of what sites use for BON: torrent size, torrent age, seeding time, remaining seeders, total seedpool)