Hello, the only reason that this was started and payments have been requested so soon is due to the rules being changed on this website.
They no longer want any posts to due with Photopass groups or any other groups that require people to send in payment as this site wasn't set up to service those kinds of things.
You will have to send a PM to the person hosting this group to see if he wishes to add another person. I personally don't have a problem with it, but I am not the one coping the disks and mailing thenm out either.
I hope that this helps answer your questions.