People lost a lot of money (some all of it) in the dot.com bubble. Despite all those stocks and IPOs being "regulated".
And in that case those stockes were heavily peddled by well known brokers or advisors (not the case in ICOs yet). Does it feel better if you lose your money in a "regulated" way? Can you recover it? When $65b disappeared thanks to Madoff the SEC looked the other way (or not at all, rather). His company was "regulated" too. But you cannot even sue the SEC...Regulation adds costs for lawyers, auditors, brokers and the exchange. But it doesn't prevent you from losing it - as the dot.com bubble demonstrated.