These types of customers have distinct characteristics and behave differently:

1. Talk big but never do anything, always talking big but never taking action.

2. The "don't pay until you see the result" type: emphasizes paying after the fact, and is willing to pay only after seeing the result.

3. Payback calculator: pursues maximum return and is overly obsessed with frequent actions.

4. The free-for-all type: Use charm to impress the other person, and try to achieve the goal of not paying through emotional connection.