For instance, lots of people like to feel that when they win, it's because they were skillful, and when they lose, it's only because they were unlucky. On the other hand, if you really _are_ investing your skills in your decisions but still lose due to luck, you'll be really frustrated. Catan does an excellent job of keeping players busy, but essentially on an equal footing of powerlessness. On this basis it really appeals to people who get all kinds of nervous when asked to play any kind of game of skill with friends.