"it's fun to play every once in while so i'll keep it."
I personally never trade in any games no matter what. Im pretty careful with what I buy and always replay games down the road even if its 5 or ten years later. Also trade in value is never enough for me considering I only buy games when I find sales (buy 1 get on half off and so on)
After a month or so of not playing Im already doing a 3rd play through for this game