Here's a great quote that proves this point:
Understand your audience better than they understand themselves. It takes a lot of upfront research, and often means being a member of the very tribe you're trying to lead -- but it pays off.
Brian Clark, founder and CEO, Copyblogger
This is a very crucial thing to any self-respecting blogger or someone starting out new in the blogosphere. Always understand your audience and never forget to give them what they want.