Don't be a retard, of course they don't work.
Thing is, from a business perspective, you will always have a bigger chance for financial success if your product solves (or tries to solve) a problem for the customer.
The more the customer worries about his problem, the easier you will sell your product.
Ex.
>Customer has a back pain that comes and goes every monday (4 times a month then).
You make a ecom website trying to sell a product that alleviates the pain (or supposedly alleviates the pain).
The customer will maybe buy it, or probably not, after all, he just worries about his back problem 4 times per month.
Ex.2
>Customer was born with a small penis. Every time he sees a girl he thinks "wow, I would fuck her so hard..." and after 10 seconds he would also think "but my penis is so small, I wouldn't be able to please her, fuck my life..."
You make a ecom website to sell a solution for your customer, you write testimonials (fake ofc) on your website that say stuff like "my penis has really grown 3 inches! I can't believe it!".
>Now follow me here:
The customer thinks about his problem every day of his life, maybe even every couple of hours and you just presented him the only solution he's ever seen.
Your product looks a scam to him, the customer even thinks to himself "this can't possibly work"... "right?" (exactly like you are now, asking me "do they work?", you are not questioning if the product is a scam, no, you went over that, you are asking now: "does the product really work?"
You want to buy it and you will buy it.
You know why?
Because you want to believe it will/could work.
Because it's the best solution you can afford right now.
Because humans like hope, the customer was hopeless all of his life, now you just gave him hope.
The product doesn't work, obviously, but to the troubled customer, he will probably say "it's working" while using the product, because his brain wants to believe, his brain is clinging to the hope.