The transit route fees are only one aspect of the overall substantial funds that flow from USA to Pakistan. If those fees go up, then something else might get reduced, so the overall impact is minimal to the bottom line. How can Pakistan benefit from any increase in transit route fees, when the real problem continues to be internal leakage and squandering of funds, regardless of the amounts?
Again, none of this auditable and verifiable.
A large chunk of the alleged funds is meant to be aid, if aid has strings attached it's blackmail, not aid.
Secondly, there's no real refutation of not having much higher transit fees other than give in to us demands because they can hurt you in other ways.