from what I understand from the website, together with what Charlie has said
between 4-5 million of its 58 million gross comes from pif
pif money is only added to the box office total when a "free" ticket gets redeemed (in the form of a promo code you use when buying a ticket the normal way, which turns its cost into 0.00)
maybe there's a lot of pif money waiting to get "spent", but it all depends on how many people try to claim free tickets, otherwise, it'll remain in the studio's hands and doesn't affect box office