Of course I would like to have a sealed duplicate of my entire collection, but even some unsealed complete gameboy stuff is way out of my budget. I wouldn't have 450+ gameboy games if I were only a sealed collector, I would probably have 20 or so. I think I have 3 sealed games, Dragon Quest IV for DS I picked up at TRU for $10, Qix for gameboy and Alice in Wonderland for GBC. Also I have a sealed Dragon's Lair for GBC that has a little slit on the side from someone cutting open the case carelessly. For me it's just a nice little bonus to have some sealed games. I also never opened my Majora's Mask soundtrack from Club Nintendo because I don't really want to listen to it.
Some people just get really good jobs and can afford to buy 2 of every game, or are single & childless, or some combination thereof. I suppose I'll admit that I'm a little jealous of those people sometimes, but at the same possessions like that can be a burden, and the more value involved the bigger the burden. The collection grows and grows, you can't sell it, you can't play the games, and you have to keep them protected for years and years. My gameboy collection (sans boxes) fits in 7 shoe boxes & I don't have to worry about anything except losing one.
People might say they are doing it for the love of gaming or posterity, but deep down you know it's because sealed copies tend to appreciate in value more. Also, I've read that you can buy those machines to seal games in Thailand
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Another good question would be: How many sealed collectors or collectors for that matter have a lot of credit card debt?