It requires more context. If a member wants to 'thrown in" their shipping card to bid on a job that requires being there in person.
To me the term “sitting at the hall” is meant to describe someone that is spending time in the hall hoping for a pier head jump or the like.
Not going to see that much when shipping is good. Even when shipping is slow most members don’t hang around long. During call most never even sit down.
- Edited to remove 'no other requirement"