I had to look up "obscurantism" on wikipedia. That is what came to mind on reading how a new auspicious day for buying gold has become en vogue in South India. More here. Of course, I'd imagine that for some of the costumers it is just another festive occasion, with apparent discounts and such. Or they are just following an emerging tradition. But I'd also imagine that many really consider it auspicious.
Turns out, obscurantism is probably not the right word, going by wikipedia. But it comes close. What would be a word for deliberately manufacturing superstition?