Possible Clues:

• Junkie joins party with couple of pills in payment for rent (4'1,3)
• Access charge
• Junkie from party gets a couple of pills in payment for renting opium den presumably (4'1,3)
• Bridge toll, e.g
• Charge to those who derive direct benefit
• Junkie's allowance for renting stadium perhaps (4'1,3)
• Assessment paid only by those who benefit