How disrespectful!
I think with more people getting acceptances at this point, they're also tuning out during the interview, tour of the facilities, and subsequent question and answer sessions (for schools they might not be interested in going to anymore). I'll be interviewing at a few more places that I won't matriculate into come next fall, but I consider every interview invite a blessing. It's a shame some people at this level would do such a thing as not show up for what they scheduled, as if calling to cancel was too much of a chore.
AAK