Traditionally correct articulation can indicate to your listeners that you are a learned individual -- well-educated both in scholarly terms and varied experiences. This perception has a tendency to gain the respect of others; it is also easier to listen to an individual who can articulate well, so attention paid to you when you speak is also an indication of respect. Note that even if your education and experience are limited, the ability to articulate has the capacity to overcome what you may lack in those areas (see Reference 3).
If you are able to articulate correctly, you may find that you are faced with more career options than people challenged by traditional and proper articulation. Particularly at the upper management level, you will be expected to communicate in a clear, organized fashion, and often will be asked to provide succinct overviews (see Reference 3). This is particularly important for a career in media, such as broadcasting.
Credibility is assessed through many senses, including sound. An articulate individual conveys credibility, both due to the correctness of the speech and because traditional articulation leads to confidence (see References 3, 5). You will find that this credibility will follow you throughout your personal and professional life, particularly in persuasive speech or other advocacy situations (see Reference 5).
Being able to articulate clearly offers your listeners greater comprehension through clarity, including using proper pronunciation, which inherently reduces misunderstanding. Remember, too, that your message organization is part of the articulation process, allowing your thoughts to flow and progress naturally. This natural cohesion of your thought processes gives you less opportunity to "stumble" through your words (see References 3, 5, 6).