in my opinion,people do a scam because they want to get a lot of profit and I think that kind of person is greedy.
anybody wants to get a big profit but you do not need a scam,you can invest,trading and mining and I am sure it is more potential you get a big profit rather than of scam.
Those people who are scamming people are smart but they are using it on the wrong thing. They are taking advantage of the ignorance of the people in the internet to scam people. They are scamming people because they know that there are people who are ignorant and they can make a scheme that they will believe and steal their money which is an easy work for them.