Just a quick comment. I've seen a TON of "I can't believe how much this sealed NES game went for!" posts in the past month or 2. Not picking out any posts in particular, but....
Sealed NES games ARE worth a lot. It's not insanity. There are more NES game collectors than everything else put together, and if you want a sealed game from 20 years ago (almost) you ARE going to have to pay for it. Now I'm not saying a sealed Raid on bungeling bay should go for $200.00 on ebay. But about 400-500 of the other NES games WILL go for quite a lot factory sealed. Well more than their original sale price.