Providing high levels of affection and "rewards" (praise, attention, intimacy) at unpredictable intervals. This creates an addictive cycle where the man spends more in hopes of receiving the next "hit" of validation.
The core rule is to never be the one more emotionally invested. The person who cares the least holds the most power in the transaction. Ethical and Practical Risks Ho Tactics: How To MindF**k A Man Into Spending...
The more a man spends on someone, the more he feels he must value them to justify the expenditure. This is also known as the "Sunk Cost Fallacy." Providing high levels of affection and "rewards" (praise,