The exchange listings of a particular coin speaks a lot about the trading volume and liquidity of that project. Some investors even look at the reputation of the exchange listings of the project before deciding to join because it serves as a clue to the seriousness of the team. Low tier exchange have low volumes and may affect the trading of a coin if listed there, hence projects must be more concern about which exchange they choose to list their coins.
Sometimes good projects there is no chance to place your coins on the major exchanges, because they do not have the money for it. And they have to place their coins at least for some markets to fulfill their promises to investors. In the future they plan due to increased interest in your project to get a listing on the major exchanges.