Why are most people interested in shallow topics? They view though provoking topics as boring.
I've also noticed that when you ask more serious and more thought-provoking questions here, you get less replies. On the other hand, when you ask things about love life and crushes, and common everyday things, people tend to answer more. I guess it's just that most users here prefer questions that are easier to answer, and more importantly, they prefer those that they can relate to or interest them more.