I don't doubt companies practicing unprofessional conduct like the above mentioned one bit (in fact, I posted on dummy recruitment above), but I don't understand the 'gain' from it. I personally would simply move on if rejected from a job and not hang around waiting to be called a few months later, and I'm sure many people would do the same.
For school student-type jobs at ASDA, where there is not so much urgency to find a job, people may be more tempted to wait as they might not have many other options, but for people like the OP's friend, I really don't see them going to work there months later, unless they haven't found another job or had their heart set on that particular place. The OP's friend is lucky that there are lots of other banks, and I hope she has better luck there.
manGrad123:I know of places where a member of HR has admitted they do this, so I wasn't being a 'conspiacy theorist' when I brought up the possibility of this.