So to clarify: if I'm an organisation with 100 private repositories, and I add an outside collaborator with access to just one of them, I have to pay $9 a month for them?
I was quite excited about this change (we're an agency with a large number of repos and a relatively small number of users) until I read your comment.
Yes, they're actively screwing agencies and software houses.
When they introduced the new organization features, I smelled they were heading here, but I honestly thought that the "outside collaborator" concept was meant exactly for not billing this kind of rare users. Guess what, greediness has no limit.