A good scam is all about finding a way to bypass bs detectors. Appealing to greed or fear while adding a sense of urgency are the classic ones for good reason. But you've got others like appealing to in group/out group dynamics, distrust of institutions, ego, desired self image, laziness, carelessness so much more. You've also got those selecting to trigger anyone with a bs detector to only spend time on those without one.

High Fi audio is actually legit to a point. Over $300 (well, $400 now with tariffs) is when the scam begins