Obviously as an investor you understand there are risks but out of all the exchanges out there, i can think of 2-3 that I would personally trust with my money and in my case we are only talking about thousands, imagine a big player with millions using etherdelta or some other retarded exchange, no way that will ever happen. Even big exchanges like bittrex, not long ago, they fucked up and made everyone wait months and months to get your account enabled or verified. Why would any big player invest in crypto when the risk is so huge, there is literally zero safety, any exchange can run away with your money and you can barely do anything.
You have a point because we can't deny the fact that investors nowadays are smart and they always choose an ico which they think is profitable and has an active team. They would choose to invest in an Ico with definite foundation and listed in a top exchanger.