Because of lot's of people want to get your money. As there are no point (and even less profit) in pointing you to coins made, controlled and manipulated by someone else, these guys all made their own stuff for every possible market segments what they could imagine. Actually there were/are a few guys around with honest intentions and good ideas but they are a very small minority. So the deal is luring you into a good looking but in reality worthless "investment" and then run away with your money, then rinse and repeat with a different name and coin.