I am planning on buying collector's editions of promising games as a sort of investment (keeping them sealed). My question is do all LE's and CE's increase in value if kept sealed? The editions I am talking about are ones that offer a physical item, for example, Assassin's Creed 2: Black Edition which has an Ezio figurine. These now go for around $400 (they were originally priced about $100).
What do you think? Do all LEs increase in price?