I would say it is more of a practical consideration. Private trackers generally enforce upload/download ratios. This ensures the health of the sharing pool stays good.
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Also, they curate the collection so that it doesn't get filled with low quality garbage.
Part of preserving and sharing knowledge is doing quality control.
Do they ensure that each torrent is seeded? Do they have a problem of dead torrents?
Usually torrents remain seeded because private tracker users are encouraged to seed everything forever. In addition, often if a private tracker has a bonus system they will offer extra bonus points for seeding low-seed torrents, and some even automatically mark torrents as freeleech if they're below ~5 seeds, encouraging people to revive its seed count in a targeted manner.
Do they do it just to feel superior about bring in a sekrit club?>
Yes.
Tho it takes time to join or never to their sekrit club. They look down on people who pick low quality or uses real debrid or DDLs. They will also ban you once they confirmed you are uploading to DDL sites.