People do this and it can go both ways. If after 10 years, there's still some 1/1's that haven't been found then the box would be worth more but if you can find online sales of all the 1/1's and account for them, then the box would be worth the same or perhaps less. You'll also find that the years with good rookie classes don't last 10 years usually because people want bust them open and cash in on the value so in strong rookie classes, could be good to keep a sealed box.