Right you can pay your money and go upstairs because you are part of a worldwide organization.
No, I meant that they let anybody pay the fee and go on in, membership in the worldwide organization or not.
I've never had a problem just walking in and paying the daily training fee, even when I wasn't with the Aikikai.
The only people I've heard about that had a problem had to pay the membership fee (about $100, far less than testing) and then they went up without a problem - without having to come from an affiliated organization.
Anyway, I don't see that as a major draw, especially considering what the training at hombu is like.