IMHO you can't put a price on the amount of pleasure you get from playing with a toy.
I opened all my G1 toys, which has decreased their value. But I also got decades of pleasure of playing with them.
♪
"You got a friend in me"♭ #toystory
Yup!

Now HasTak are putting those recycling triangle symbols with the numbers on them. I noticed that my TF Go! Optimus Prime's window has that symbol on it, so my local waste management centre ought to be able to recycle that easily enough should I choose to discard that box.