Now very few people buy their tokens on the exchange. The main task of any team in a startup is to collect the necessary amount for further development. What will happen to the price of the token on the stock exchange already few people care about.
So it was with the ICO. For IEO, there are completely different requirements. Read what conditions exchanges expose projects for IEO. This is not just a listing fee. This is a series of comprehensive measures and requirements. Including the maintenance of the value of the coin is not lower than the IEO for a certain time. IEO is a serious thing.