#1 scam.
Fuck those things running.
Scams prey on different emotions of people, fear, greed, desperation, laziness etc. For a lot of the things like
@ColtWalker1847 mentioned, it's an interesting blend I think half of the people are uniformed, and needy the other half are greedy. Something like a how to make money, it's pure greed, no one in those is a good person or stays in them once they learn.
The health stuff, people can hide their heads in the sand and the power of the mind does the rest. I don't mean to go easier on them, but I feel if you are willing to spend your money on a 30 dollar bottle of juice and it makes you happy go for it. I can't justify some of my spending I'm sure you can't either. But it brings some joy or a feeling of reward. Now if you want to research you'd learn better and maybe make better choices but we are far past the days of snake oil where they are turpentine and gin with some rose water. Some sure are dangerous still but not like the old days.
The ones I really hold a hate boner towards against is MLM shit. It does not make sense, the concept itself you can't logically explain, and it turns people into cultists. The model just does not work it is that simple. It's predatory and I love small companies, seeing people who want to make it on their own, want to build wealth is great and this preys on the people who have that spark but are unsure where to turn. They are often scared off by the costs of consultants and instead of investing 500 dollars into an hour or so with one they see a guy on TV with a Bently saying for 200 you can be just like him.. then you gotta buy their product. A fun way I like to shoot MLM people down is ask them to cover my costs. I mean I'll make you money so why should I shell outta pocket?
Entire industries are shams and scams and I don't mean small market stuff, I'm talking billions or more dollars.
Also for at
@millais mentioned, things like that walk a line of scam, but also it's a fair game hustle. Because end of the day you get a product or result promised. Many people for example will say 50 bucks for an oil change that took 10 mins and used 6 dollars of product is a scam, well if you don't know how to, or feel your time is better spent else where it's not really.
Also I've worked in a field as have many others a monkey could do, but there's legal certifications required to keep people out of the loop. In many ways that's a scam. Not to say I support a swing towards the other way of letting the guy next door do a lung transplant. But you get my drift.