Similar concepts are already being sold as viable for their human customers, who, presumably, can think and evaluate. Venus has never heard of the placebo effect and she can't talk economics. If I thought a magnetic blanket was good for her, it probably would be. Before my hand jerked for my wallet, I wanted to know just exactly how the increased circulation of the blood was achieved by magnets and what mechanism afforded penetration to the trauma. Don't get me started on magnetism.
Nobody really knows much about it.
There is no acceptable scientific explanation of just what a magnetic field is, period. That's about as far as science gets. Effectively, there has never been a better scientific climate toward magnetism because it has nothing to do with science. It is a part of that large mumbo jumbo out there which doesn't register scientifically. It is this ambiguity which makes magnetism all the more attractive to humans.