I don't like doing it, myself, but this is pretty much a result of this same behavior coming from interviewing companies. I don't know how many times I've gone in for first, second, or even third time interviews and then complete radio silence. After a while I'll just assume I didn't get the job. That happens to you enough, it's bound to start going the other way. If enough time goes by, I'll just write the company off as someone I don't ever want to work.
So here's my shocked face. I'm shocked that something that companies that have made this kind of professionalism a norm are now dealing with the repercussions.