Fight City is one of your newest releases. Fight City has some aspects of collectible card games, but it's not collectible. We figured the fun part was building the decks, not buying the cards, so we sell the entire set as two fixed decks. Players are paying Fighters to beat each other up, and trying to run each other out of money. It's an elegant game, and we've heard very good responses in the short time it's been out.
Card games do have a high profile, and there are probably two things driving that.
Card games are cheap to produce. So people who are trying to get into the business usually do it with a card game. I wouldn't be surprised if even more people tried it next year, now that Pokemon has proven that it's possible to compete with Magic. There are some cards from the preliminary versions, like 3rd-level fighters and lots more Events, which didn't make the final cut. And lots more good Fighters and Weapons that simply didn't fit in the first two decks.