there are more people who are get scammed by ICOs because investors will place their investments through their hard-earned money and then that ICO will not give you any coins or some will give but never bump on coin exchanges or even on www.coinmarketcap.com
I haven't been scammed by ICOs because I never invested any altcoins on their ICO stage but instead I just wait for them to hit coin exchanges and but coins as many as I like.
A friend of mine has been scammed for worth of 3.6 Eth and I don't think it's painful for Him.