Recently, too much number of ICOs are failed in terms of their funds raising, I am not saying that they are scam , all I meant is that some investors are tired on investing on a projects which are they guarantee that they can't make profits with that why some ICOs are not having some funds to develop their project. In these days that IEO is trend, I rather choose IEO so that I can guarantee that I can immediately trade my tokens/coins upon tokensale concluded.