Everyone knows superstitions are dumb, like throwing salt over your shoulder if you spill some, never opening an umbrella indoors or wearing a helmet while riding a motorcycle. If you tried to start a business teaching people how to hang horseshoes over their doors and avoid black cats, you would be on welfare pretty soon.
See, I tried this and nothing happened.
But bring the superstition from a foreign culture, and suddenly you are in business. You can apparently still convince a shockingly large portion of the population that you can see the future if you're doing it with Tarot cards. They come from the gypsies after all. Of course, these same people would slap you if you offered to tell their fortune from a standard card deck.
"Okay, so I guess three guys are going to ... beat you to death with a club?"