I do not think that 50% of failed ICOs is too much. In any business, percentage of loss-making campaigns is high. If we take the sphere of startups, only one project out of ten survives there. So, it is not so bad in the field of ICO as it is given in media
You are absolutely right 50% is a very good indicator, unfortunately as a result of my observations the percentage of failed ICO is more than 90%.