No, that is not how that works, you get to evaluate and use it for 60 days, IIRC if you register it you get it for an additional 30 days. Then if you decide that it is not for you for what ever reason then you simply don't continue to use it. You do not have to pay for it if you don't continue to use it.
You are assuming that you may not feel that it is worth $100. You might find that it is worth $200 to you.
After having used it almost daily for about three years I would have to think before paying $300 but certainly not $100. I actually bought 5 licenses at a considerable discount off the single price. I did use the entire evaluation period as I was being very picky about what I wanted out of a file manager. I could find no hitches or anything wrong with the program which is something I cannot say about the other 15-20 file managers I tried out when looking for a replacement for Power Desk. After seeing what it would do, my father, wife, and son wanted it on their computers. Swingman bought a copy too.