To me the answer is simple.
Many people dont like to research and find out the answer.
They will believe anything, and if someone promises them x-profit its a nobrainer for them to "invest" their money.
These kind of person doesnt really value their money at all where they do carelessly invest into things which they saw they can able to make profits without doing much hard work.They do already saw the results and the things do happen and the convenience that it gives without even minding the risk involve if this business is sustainable or not.Realization would happen if they do already facing consequences.