@Madeon
There are a couple of problems with your theory and assertions.
But that is, in fact, exactly the point! Those students are probably really wanting other schools more, and will be disappointed if they have to “settle” for WUSTL, as ridiculous as those of us that know WUSTL understand that to be. They are often dead set on HYPS and anything “less” won’t do. If you really think about what you are saying, you are asserting that these students have a “right” to be accepted to a school like WUSTL simply because they have been accepted by schools that are even more competitive for admission. This “right” is being violated, ergo WUSTL is doing something underhanded, or selfish, or shady, or some version of these things. I know you know it really isn’t a right, but that is shorthand for your contention that they should have been accepted if they can get in to schools with more competitive admissions.
A hole in your argument is that WUSTL, in fact, offers admission to hundreds if not a thousands of students that have stats equal to those you know that got denied/wait listed. So clearly something else is at work here. What can it be?
All schools, and especially schools like WUSTL and Vanderbilt and Tulane, etc. that are not Ivy or Stanford or MIT but get applications from a lot of students that aspire to those schools, want students that really want to be at their school. Surely that makes sense to you. And if you don’t think that these experienced admissions people at these schools have a pretty good eye for figuring out who those people are that are using WUSTL as a “backup”, if that is more descriptive for those people than the term “safety”, then I think you are kidding yourself. Can they get that 100% right? No, but they are amazingly accurate. They have learned numerous “tells” over the years. Most people rave about the cohesiveness and welcoming atmosphere at schools like WUSTL and Tulane, two that I am very familiar with. You think this is an accident? By not offering admission to those students, they avoid getting the ones that get shut out of HYPS et. al. and spend their first year or two at WUSTL depressed and grumbling, hoping to transfer into HYPS the first chance they get. Kind of the opposite of the atmosphere admissions is trying to foster.
Is there a secondary effect that by being selective in this way WUSTL and these other schools have lower admission rates and higher yields, which look better for them? Sure, but that is hardly the motivation since it really doesn’t affect the rankings at all. I think everyone would agree that USNWR is the ranking that matters most, and certainly is the one that universities “game to”, to the extent they do. Which also makes your theory less than credible. USNWR doesn’t use yield at all as a factor, and admission rate is only 1.25% of the current formula, and has been between 1-1.5% for years. Hardly enough to move the needle.
So it really leaves your discussion of nefarious or immoral or whatever negative adjectives you want to use for their “motives” in denying/wait listing these students somewhat wanting. Rather the simpler explanation, that they are in fact looking to offer admission to students with excellent credentials that they have judged really want WUSTL, seems best.