But the IEO helps you make sure that the project has been assessed through exchange. And that it is definitely listed on the IEO exchange, it also attracts many people to buy token of that project.
Although it does get guaranteed listings. the exchanger does not guarantee profit. Isn't this also the same, it's true that they are profitable in terms of listings but for the price problem there will be none. this also happened to ico who had no guarantee. but indeed the IEO is better than the ICO which currently has a lot of fraud
When already listed in market, exchangers or developers team can not guarantee on the price, its depend on supply and demand. I think no one can guarantee the project can deliver profits to investor because like others investment, price always tend speculative