A friend of mine got into Star Trek cards in the 90s, at the height of the trading card games craze. He got two complete Next Gen sets and was considering selling one of them for a few thousand pounds (UK) to fund a trip to Gen Con. I advised him to go for it, but he felt if he kept them they would become even more valuable. A year or two later the trading card games bubble burst, taking down several companies with it. We lost touch, but I sometimes wonder if those sets are worth anything these days.