Marketplace products license question

Which option do you think is best?

Pay 50 $ for a product and have it per-tittle?
Pay 300 $ or more and have it for life?
Or have both type of licenses, allowing you to choose what you want or need?

By the way, this is not because of my Ledge Climbing system. My system is made with Blueprint and there is no way I can control what a buyer would do with it.
I am just debating with you guys about how we all prefer thing to be.
So, please vote on the Poll.