HYIP as the name implies are are high risk investment platforms where in most cases never ends well. Common HYIP platforms includes ponzi schemes. Today there are lots of persons investing in ponzi schemes even when they are aware it would crash at any moment. People still invest in them cause they believe in luck, they believe they would be amoung the lucky ones that would be able to cash out first before it crashes. While some still invest in it simply cause they are looking for cheats and shortcuts to make money.