The real story from The Beatles Bible:
There was a big talk at Candlestick Park that this had got to end. At that San Francisco gig it seemed that this could possibly be the last time, but I never felt 100% certain till we got back to London. John wanted to give up more than the others. He said that he'd had enough.
--Ringo StarrThe Park's capacity was 42,500, but only 25,000 tickets were sold, leaving large sections of unsold seats. Fans paid between $4.50 and $6.50 for tickets, and The Beatles' fee was around $90,000. The show's promoter was local company Tempo Productions.
The Beatles took 65% of the gross, the city of San Francisco took 15% of paid admissions and were given 50 free tickets. This arrangement, coupled with low ticket sales and other unexpected expenses resulted in a financial loss for Tempo Productions...The stage was located just behind second base on the field, and was five feet high and surrounded by a six-foot high wire fence.
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