Networking for job search, business development, or career growth is valuable for a few reasons.
1) You have to get clear about what you want to do and why you want help. Writing down your intention or goal is the biggest step toward actually realizing it. And asking someone else for help both forces and guides you to get very clear about your intention.
2) You'll make the connections that will lead to a job or work or customers. The vast majority of jobs are filled through referrals and networking, most consultants build their businesses through referrals from happy clients, and businesses rely on "word of mouth" to generate sales and build their brand.
3) The very act of talking about your goal will help you reach it that much faster. When you are out there talking about your intention, the universe can step up to support you.
Remember, while you are preparing to get your "right fit" job or embark on your "right fit" career, that job or career is preparing to meet you. Employers are writing job descriptions, businesses are developing consultant specifications, people are beginning to understand that they can't do something by themselves and need to hire someone.