It's passion that keeps us podcasting. We love it. Podcasting is more than narcissistic, although you do need an ego to assume that hundreds (or thousands!) of people want to hear your view on something. It's not all about you; it's also about your passion. Many people have said their podcast has turned people onto whatever their subject is; people listened to their podcast without being familiar with the subject! So you'll be getting people excited about the same things you are excited about. And that's where the narcissism comes in.