They understand that they are getting value for their money: A cow is worth nearly twice as much if it is vaccinated.

VOA: special.2009.11.03

But one reason why they ask for money is if you don't pay for therapy you don't think it has any value.

但他们收钱的其中一个原因是,不用付钱的心理治疗，你会觉得它没什么用。

耶鲁公开课 - 心理学导论课程节选