Good point, Brian and if you take into account, the OTCBB practices for reporting volume traded per day, then the volume is 1/2 of what is reported. OTCBB volume reporting follows that of the Nazdaq whereby both buys and sells are counted as shares traded. One must divide by at least a factor of 2 to get an accurate account of the % of actual shares traded.
http://www.lehigh.edu/~incbeug/Attachments/Anderson%20Trading%20Volume%20paper.pdf