Mike changed the requirement for selling items, they don't need a minimum of posts and while you do still need a minimum to post a picture you can link one at any time.
I think people think because they are a regular on another board, like pirate and/or have been watching the marlin board for a while before signing up they don't feel like they are newbs. I agree they should be introducing themselves first though.
I'll give Mike a heads-up about this thread and see what he has to say.