Just experienced our first Non-refundable campground

I understand why parks have to have these policies but I also believe if they are able to rent that space on the day or days in question they should provide a refund minus a reasonable cancellation fee.

I will not make a reservation at a no refund park until I am 99.9% sure I will make it to that destination, however I nearly go burned this year when all of the parks at my scheduled stop were all booked.