Credibility matters in life, but it especially matters for journalists. Whenever you pitch a story to the media, the journalist is subconsciously measuring your integrity and experience. If the producer is going to invest time and energy on your story, he wants to make sure the idea has credence from the start so he’s not chasing false leads.
A lawyer pitching a story on corporate fraud or a teacher pitching a story on education reform will always have more credibility at the onset than a retired citizen who works part-time at the public library. The journalist will rightfully assume the lawyer and teacher have insider knowledge or expertise, which will lend credibility to the topic.