Board games have an advantage over trading card games and miniatures games (not many, but this is one.) Once you purchase and play a board game, if you don't like it, it's pretty much too late. If you really don't like the game, you might think twice before purchasing again from that publisher, but really each game is independent, so quality varies greatly, even from particular designers.
With a strong license, good word of mouth, or a powerful marketing campaign, enough people might buy a bad board game and it'll still make money. Even if the the game is terrible, it'll still be in the game closet, fully playable.
With trading cards the games require that the fans buy into the game and not only purchase the 'base' game, but also expansions in the form of boosters. If the buyer doesn't like the game, they won't follow up with more purchases, won't play the game *at all* and likely won't find opponents even if they wanted to play.
Moral of the story: Don't make a trading card game unless you really think your fans-to-be will be moved to purchase boosters. 99% of the time, they won't. On the up-side, if you're a 1%-er, you're probably going to get rich!