Whether you like their product or not, they've created something consumers want to buy.
Years ago all of my older relatives and in-laws were wearing copper bracelets because they did something 'magnetic' or 'electric' to help their arthritis. It was no use trying to convince them otherwise. :(
"magic" devices to make you healthier/perform better/more wonderful have quite a long history of making money so with the right person probably is a great investment and there is a whole world of people investing in this, that and the other outside of the valley.
The same way companies selling "wireless antistatic bracelets" get funding.