Cougar might also have been referring to Panhellenic messups (like CutiePie 2000's icky bad experience) in which case, the chapter is only doing what its school panhellenic tells them to do. Whether it is the right thing may not always be the case.
I see what you are saying about not getting someone's hopes up - not to mention the "sorority rushees" could be 58 year old men for all we know.
But I really don't think someone is going to say "I know I will get a bid because 33girl said I had a cool signature!" We're showing a big part of Greek life which is being supportive of other Greeks and prospective Greeks.