u/dhowlett1692 answered How did the Salem Witch Trials become the face of historical witch hunts when European witch trials took place earlier and were more numerous? and Why doesn’t Salem, MA treat the witch trials with more solemnity? which both talk about the development of the Salem tourist industry from the 1970s and on.

They, or someone else, may have more to say on the topic as it pertains to this question specifically, but some of the basic information relating to your question is present in both of those answers.