Sitting on a bedroom floor crying is something that makes you feel really alone. If someone’s singing about that feeling, you feel really bonded to that person. That’s the only way I can find an explanation for why 55,000 people would want to see me sing.
Slytherins tend to be ambitious, shrewd, cunning, strong leaders, and achievement-oriented. They also have highly developed senses of self-preservation. This means that Slytherins tend to hesitate before acting, so as to weigh all possible outcomes before deciding exactly what should be done.