The problem is that people just love easy money. I'm talking about the creators of scam who do not want to do something useful and just cheat, and about investors who do not understand what to invest.
Both are looking to take quick earnings without dealing with real projects that will progress after some time, investors need to be more furious about projects that they will invest their money while developers needs to prove that project is reliable and have a good future outcome, ico scammers are very tricky as they can really attract people to invest even there's no possible progress they just provide promises that very attractive and unnoticeable with
newcomers and grab their money very quickly.