Lots of companies/industries pray on hypochondriacs, the "vitamin" industry for example. I wouldn't be surprise if they sell shady tests (high false positives/negatives) at a premium for people who "want to be sure". I've seen the same for STDs
I recently learned from a friend in the industry, that when companies run "clinical" trials for their products, they almost never use a control in the study. It's pretty much just "Use this product that is specially formulated to do this, and report back if it made a change".
