Remember, Parker and Elvis made their money from the sales of the album, and the TV rights for the worldwide telecast. So, they probably made more money than a normal show anyway. So, it's a win-win for all concerned.
Additionally, tickets to the rehearsal show were sold after the January 14 show's tickets were sold out.
(Reference: The Honolulu Advertiser, December 13, 1972).
Getlo - cute'n'cuddly
It reached #1 in Billboard, (Top Lp's And Tape) on May 5, 1973, 11 weeks after it had been released.
The week before "Aloha" became #1, it was sitting at #2 in it's 10th charted week.
They way Elvis spoke of this probably added to the confusion; on the rehearsal show he mentioned the goal and said "and tonight, we had $75,000 for 'em," seeming to indicate it had just been raised on that day for that show.
Of course, Elvis also called it the Kui Lee Cancer Drive in the broadcast, which always made me cringe because it sounded like they were trying to raise some cancer. He was so much more composed and connected during the rehearsal show...not to say that isn't understandable.
...you won't forget me when I go.