I sorry but I must disagree with you. It is the obvious place for him to be there in person.
The CofS is really hurting with the current recession, the outer orgs are almost certainly producing negligible income and in many cases are probably getting some income support from Int. The AOs are probably not doing much better.
The Flag reges would know who among their public have substantial liquid assets and I bet that they, these public, would have received special invitations. The CofS probably needs these assets to survive. What convinced me, was Miscavige's talk about Ideal Orgs.
I have no doubt that the structure of this event was quite different to the videos of the event sent out to other orgs, and I am sure that those with the money, had received special treatment.
Just a thought.