I think most consumers would agree that this is the fairest model. If I pay for 30 days of Netflix, only charge me for the days I watch so then I feel like I'm using my entire purchase.

The current SaaS model is like going to the store and you can only buy 5 gallons of butter or milk and you have one week to use it. It "feels" like most of your money is being "wasted". At least that's my perception.