And the simplest is percentage of deposit
I stand corrected.
But the percentage of player loss is also very simple.
I think the real value of the PWC Auditor Reviews is in marketing the casino to the public and not in providing an account review.
From PWC:
The scope of this review does not include any reviews of financial controls or back office procedures, including those relating to amounts received from, or paid to clients of the Blackjack Ballroom Casino.