Unusable affiliate commission: How fair is it?

Hi all

I stayed at a recognized host (recommended here by many). He also had an affiliate link that earned a commission of around US $ 30. As their renewal costs were around USD 35, I thought I could use the commission and pay the balance. But to my surprise, said the host, he has to earn $ 100 before he can retire and pay for accommodation.

To remove the condition may be fine, but why can not they use the accumulated amount internally? I have to move and stay somewhere else. This is the first time I've won the affiliate commission, I feel like my money is being wasted.

I just want to know is this fair?