You think anyone involved in the project cares? The money to build this crap will probably be borrowed from banks. People involved will be lining their pockets good for 5-10 years. Government will be happy for jobs created. When the project goes bust, the banks will go: "I am once again asking for your financial support".
If the project does succeed, it will be a fortunate accident for everyone involved. But I don't believe that its prospective success is their primary concern.
Only before it opened, but the press didn't really report it very well.
They posted accounts for the 3 months before they opened (minus 2 days) saying they lost $100 million in that period. The press picked up on this as "The Sphere is losing money". We need to wait for the next set of accounts and the ones after that to see if it is profitable.
Adverts cost $450k a day (according to gaming articles on Xbox's advert in October), they also have 18,600 seats inside the LV Sphere for "immersive experiences".