Don't assume that someone with something to sell, who is getting good press and running lots of ads, will take care of you.
That "guru" may just be good at press relations and self-promotion.
Certainly, talk shows and the media at large can and do provide useful information on a variety of topics, but bad eggs sometimes turn up. These bad eggs may not always smell bad upfront. In fact, they may hoodwink people for years before finally being exposed.
More details to come on resources you can trust and those that could cause you to go bust!