Answer:
I would say foot-in-the-door persuasion technique.
Explanation:
This is because they already have the customer hooked, since they dont care about the money aspect.
Here are some more techniques with examples...
Central Route of Persuasion
I will quit smoking because there is lots of data showing that cigarettes cause cancer
Prior Commitment
I previously agreed to wear that candidate’s button, so I will vote for them
Principle of Reciprocation
You gave me a free sample, so I feel obligated to buy something
Principle of Authority
9 out of 10 dentists recommend this brand
Mere exposure effect
There is a Starbucks on every corner, so that is your first stop for coffee
Foot-in-the-door
I already agreed to lend you $5, so I don’t mind if you raise it to $20
Door-in-the-face
My mom said no to Disneyland, but agreed to take us out for ice cream
Low-ball
The car is originally advertised as $299 a month, but after all the fees will be closer to $399 a month
Barnum effect
When a vague description like a horoscope applies to you
Framing effect
1 out of every 10 people win! As opposed to 90% lose
I hope this helps!