I don't know, it depends of what you want to do?
Do you want to play for free and ask for a refund and are you sure your code will be still valid until this time?
Or are you satisfied of your purchase?
Since the game is not out yet, I guess You can't really know, but Do you want to support frontier or not?
You could also just give your code to another person as a gift. The choice is yours really.
I don't really get the point of your question...