When I looked at SCOIR data for our feederish HS, it was pretty apparent what the competitive ranges looked like for different highly selective colleges in terms of GPA/test score combinations.
We also do not get 10 (or in fact 5) people into Stanford every year, but that is probably because we did not have 10, or indeed 5, people in Stanford’s competitive range applying to Stanford every year.
With colleges like that, sometimes it will be 0, sometimes 1, sometimes 2. But I saw no evidence it was somehow fixed, we just never had enough applicants in their range that it would be likely to be more than 2 anyway.