I think @cameo43 is completely on point… Most schools pride themselves in high yield rates. Think of it like this if there are kids A & B, both with very similar applications and strengths, but kid A is applying to 3 other schools, while kid B is applying to 6 other schools, Kid A is a safer bet than Kid B.
On another note, last year I was explicitly asked in my Exeter interview if I was applying to Andover…
And most other schools asked what other schools I am planning to apply to… So, I just listed 3 or 4 other schools from my whole list…