Kids, don't try this at Maple Hill.

So I'm better off npcing my Sunshine or selling it in the Fm?

Personally I recommend saving it and popping 100 to 1000 in every 5 minutes during slow periods, like right now. To see at which point you make a continual noticable difference in tree growth.

At the very least keeping the sunshine gives you the ability to expidite slow periods if used correctly, there's just no value in hundreds of people dropping 10k chunks in at the same time.