People scam to earn money fast and why would someone not want that i think people are tired of waiting and having patience for them to earn bitcoins or even to wait for bitcoin to grow and that is why they think lets start scamming then i will earn more and faster.
They are lazy people that doesn't want to earn in the right way. And they found it out that scamming people is the best and easiest way for them to feed their family. I can't take to let my family eat something that didn't went through my sweat and blood. I can't take it to feed them with food that I bought from dirty money, I don't know on how these people can take this type of activity and manage to have a strong appetite.
They probably have no remorse at all, I know that I will not be able to sleep at all if I knew my income did not come from a legal source, I will always be looking over my shoulder and I will feel guilty for those that lost their money, but those kind of people have no empathy at all and that is why they can do that.