Well if the average is quite low, being above average might not have much of an ROI.
Being a strong writer is incredibly valuable, marketable, and in my experience a pre-requisite for success in the "knowledge economy" (outside of some people that are able to get by on deep technical skills alone).
Being a strong writer is incredibly valuable, marketable, and in my experience a pre-requisite for success in the "knowledge economy" (outside of some people that are able to get by on deep technical skills alone).