Hi HVDB,
Many people have done studies regarding the clickthrough percentage based on the different SERP rankings.
Here is a study done by a grad student:
http://www.seoresearcher.com/distribution-of-clicks-on-googles-serps-and-eye-tracking-analysis.htm
More accurate results have been extracted from the AOL data that was leaked:
http://www.seo-blog.com/serps-position-and-clickthroughs.php
I think this all might help explain why the low traffic. :hattip: