I think anything Nintendo is very collectable sealed. I have found that my niche is collecting sealed hardware, it tends to keep it's value and in some cases sky rockets in value. When I set out to collect games I generally look around and see whats getting rare, I don't wait for something to sky rocket so that I have to pay outrageous amounts for it. I know there are some game companies that always have games that become collectors for example Squaer Enix but I have not gotten that part of the formula down yet. I like to collect when the games are still at retail level, I see nothing wrong with that.