I was digging through some old stuff last night, and I found some old cards from a trading card game I used to play when I was much younger. (Yugioh). I just happened to get into the game when it was still new, so many of these cards are 1st editions. So out of curiosity, I looked up their value. Some of them were worth as much as $50 each. Most were only worth a dollar or two, and a few were worth $20. This was unbelievably surprising, because most of these card are only 7-8 years old. Here's my question. These cards' value adds up. It doesn't add up to a fortune, but it adds up enough to buy a few parts for My AR project. Should I go ahead and sell them, or should I sit on them awhile (years) and see if they increase in value? Thanks.