When I think about who succeeds in the corporate world it's usually the people who are willing and able to communicate their ideas. I'm not only talking about highly-skilled presenters but also the Average Joe coworker who makes the attempt by expressing their ideas out loud.
Wallflowers, regardless of their marketing, coding, analytical, etc. prowess, can be tagged as minimal-contributors and lacking leadership skills. This could easily translate into lower evaluation scores which would in turn result in smaller salary increases than their well-spoken peers.
For job-seekers, all else being equal, the better communicator is often the one who gets the highly-sought, better-paying job offer. These folks start out ahead from Day 1 in the office.
What are your thoughts? Does $9000/year pass your "smell test"?