Next step is to post that same warning on the same users even when the user is logged in!

This, the big red warning should be seen by registered members also, not just unregistered viewers.
So many registered newbies just don't see what's right in front of them and get scammed by a seller with plenty of red trust. If the same big warning was seen by registered members as seen by unregistered viewers then that would go a long way to stop scamming.