Adding an extra 25? Do those 25 get their dorm assignments last? Do they take a January admission if the year’s yield is to high? An overseas first semester? Many universities have these programs in place to compensate for the students that fail/leave during or after their first semester, not the case with 98% freshmen retention rates.
Looking at some of the the common data sets, say 65% of students are full pay. Those students likely chose their top tier meets full need school over offers of $20K to $40K/year at other private institutions very capable of educating students to succeed. Remember that they are not all from wealthy families. Once any student is accepted, it is now the school’s obligation to fulfill its promise to house and educate the whole class, not shoehorn them into overcrowded dorms and cafeterias at over $16k/year.