Comment by dredmorbius

Front-page space is limited and a precious resource. There are 10,950 slots in a regular year, 10,980 in a leap year, and ~400k submissions, such that if you're batting average about 2.7% of your submissions stand a chance of making the front page.[1]

Resubmissions are permitted for that reason, and going through the New submissions and flagging and voting appropriately does help keep front-page quality higher.

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Notes:

1. See "A Year on Hacker New" by Emilien Sanchez of Whaly.io (2022) <https://whaly.io/posts/hacker-news-2021-retrospective>.