Thats a good question. Exchangers are actually playing big role in the coin evolution because that is the only platform which connects the investors and projects by bridging them. I think this way people benefit from trading the coin and profiting themselves while on the other hand crypto currency gets invested heavily and they ultimately raise the funds for project development. So its like the portal from where crypto currency can gain the value for themselves. Apart from this people do come to know which coin exists in the market and which is great from all of them, by means of volume, orders, value etc.