Why? because people are not educated. It's all about the hype. His favorite YouTuber make a sponsored video about an ICO and he decide to put all his life savings there. He see a score x/5 in an ICO rating system and he decide to invest.
People should understand that most of these coins are a pure scam. If whoever is creating these coins was interested about coins and creating a Bitcoin v2.0 he would've contributed to the original source code instead of taking people money to do so.
So as long as people are not getting educated, demand will remain and coins will continue to get sell even If they are have no purpose.
Exactly! Most of us are lazy when it comes to reading which is the most important thing to do before deciding to invest in an ICO that is why most people were following someone especially those who are famous person and immediately trust that someone making a review or posting a blog hyping people about certain ICO project. People must insert some effort thru reading and researching to avoid the big risk in investing the hard earned money!