[Discount Toyman]

It all comes down to this. If you are buying because it is something you want to enjoy yourself and you have no intent to resell, then open it. If you are buying it with the thought that it will go up in value and you may resell it for profit then leave it MISB.

If you don't plan to resell then it doesn't matter if it will go up or not in value. So you may as well open it up and display it.

The only other reason I can think of to keep it in the box if you don't plan to resell, would be just so you can say you have one in box still when your toy becomes a sought after collectible. Bragging rights.