I haven't seen a successful IEO token that is rising above the coinmarketcap top 100. Maybe the IEO is just a another kind of flop and scam as well. But this gives opportunities to small exchanges to be known if the project is well presented and gets the interest of people that will participate, so this is a win-win situation for both exchange and the project. But as I've said there are still no top IEO tokens and it disappoints me because it was overly hyped by those wannabe crypto experts that doesn't really concern on the crypto but only the money they could possibly earn.