You're a goldsmith, and a couple of guys approach you asking you to make a special gift for a friend. It's a Greek-themed tiara, and they want a specific inscription. Well, what's the worst that could happen?
Emil Rupp spent the late 1920s and early 1930s being lauded as the most impressive experimental physicist in the world. He managed to pull off experiments that no one else could. He worked with Einstein. And he'd made it all up.
Every new promise of futuristic technology brings with it the hucksters, the swindlers, and the merely confused.