A magic eight ball is a cute gag gift. It's a classic in fact. But, I'm not sure I would compare it to a Ouija Board. I know they should be approximately the same thing, but many people take the Ouija Board much more seriously.
Both are just ways of figuring out an answer that you probably already know. Or just a way to kill time.
But, some people are genuinely scared of a Ouija Board and I don't think anyone in their right mind is afraid of a magic eightball.