Unfortunately there are a lot people out there wanting to take advantage of those who are desparate for answers, and relief. People selling "snake oil" cures have been around for hundreds of years. So this is nothing new, just the addition of the internet provides a new way to prey on people.
That's not saying all natural treatments are snake oil. But you really need to do your research, AND talk to your doctor first.
A lot of things haven't really been proven either way IMO either. Look at the fish oil. I just read a study the other day, now they are saying it didn't help people with Crohn's. So it's just important to keep your doctor in the loop, and do your reading! Because not only could you lose your money, but it can be down right dangerous for your health too!