What you have paid for it is named as "Sunk cost", a cost that has already been incurred and cannot be recovered.
Customers would like to pay for something more just because they had paid for it before.
So, you could take 2 principles in your business model:
沉没成本指所有你付出的,是一种已经发生且无法收回的成本。
消费者更倾向于因为他曾经为某样东西付出过,而付出。
所以,你可以在你的商业模型中使用这两个原则: