In the User Type Report or any user report, users are part of your count which impacts your overall cost, for 365 days after their last interaction with an asset.
When I run the User Type Reports, I have internal and external users with no "Last Activity" date and the # of assets viewed, commented, edit or created the last 90, 180, 270 and 365 are all ZERO. Shouldn't these users no longer be part of your user count?
Also, what does it mean when the "Highest permission given on assets" field says [[ BLANK ]]?