Popularity - just as casual view of the amount of videos on the Scan Pyramid Project indicates its popularity with, collectively, millions of views.
Revisionists will never have another chance like this ever again and, I believe the effort should be made.
The Fame and Fortune thing, therefore, is potentially a motivational factor in this regards and, if necessary, one could play the Pay per View Card which would, conceivably, generate billions of dollars in revenue.
The Void - truthfully, I'm not expecting any earth shattering finds and, in fact, I expect what they are going to find is fully in keeping with Egyptian Ideology for, what they are going to find is the Hall of Hidden Doors mentioned in the Pyramid Texts under the Fourth Hour and, were this information presented convincingly to Mr. Hawass, along with a Social Media Campaign and the Pay per View enticement, it may result in a Live Stream Event and, even if nothing earth shattering was found, it would go along way to normalise relations between Egyptologists and Revisionists.
One could look at the recent release of the UFO Video by the Pentagon and realize that now is the time to try this and Revisionists will never get a chance like this ever again.
MoA's motivation - one way or another its simply to protect their wallets, pure and simple...