Quoted from jar155:
No, the main reason it carries a premium is because the game is good. The limited production capacity is a factor, but if it wasn't a good game, it wouldn't be selling above NIB value. You've been kicked out of Spooky threads for drive by trolling without any real reason to be upset.
The production rate for Spooky games isn't a problem for them. They don't want to go bust, so they work on a lean production staff and they don't overextend themselves. When they build a game, they expect the run to take 1.5-2 years to complete. If you aren't the type of person to be able to wait, you don't buy. In the end, Spooky still sells their full run. They don't lose anything.
I think you can abbreviate the explanation to a simple: demand > supply.