Jon your right the girl probably don't read them but that's not why they are there.
They are there for the very reason you use them, to help others find cards they might like. To comment on the pro and unfortunate cons of a lady, her show, or how the outfit and props work.
I recommend to any new user to read them before buying cards with tickets to avoid getting one you probably won't really want. Once a ticket is spend it's gone like the show or not.
I also recommend to write a comment on any show you enjoy. If you didn't like the show share your problems but be polite, add your critiziums but remember you're talking about a lady and there is a chance that they read what you say about them.
Not to mention, bitching for the sake of bitching doesn't really tell anybody anything about the show but does tend to tell them something about you.