I really think these IEO thing is only good for the top exchanges and these is because they have the liquidity and the traders to pump a coin after listing, which is why their IEO projects are usually successful.
But the smaller exchange don't have the same and their IEO success rate is no way near the top exchanges. Maybe 2 out of 10 IEOs conducted on the small exchanges would succeed, while top exchanges boast of a success rate of like 9 out of 10.
True you said that the most frequently successful IEOs are exchanges with good market backgrounds and these good exchanges are Binance, Kucoin, Bittrex, Okex, and Bitforex and some of them are not which is good for me because often the price of the token does not improve as it enters the platform exchange.
Reputation is always been tied up of exchange success on any field or new methods that being used on.Remember those ICO days where the primary target of project owners is to get listed on top exchange since they do know that it can boost up its prices and same goes with IEO thing where people will normally choose up those who are on the top
because they know that lots will be longing or to look after with those projects which they already presumed that it will really make up some decent profits
since volume or majority is trading up with those exchangers so its just normal to see on where would people go.