In fact, there are some coins that one can only get on this exchange. They seem to have grown recently as demand has outstripped supply. They even had to close the exchange recently to new users.
https://www.coinbureau.com/review/cryptopia-exchange/
There are many complaints online though of rather poor customer service. Perhaps this was a result of the exchange buckling under user demand.
What are your views of the exchange? Security and reliability?
Any exchange should have an insight, customer service or support is so important that failure to address even a small issue can lead you a lot of complaints from so many people and once people post negative feedback, it will have a big effect even from one disgruntled user, so they better upgrade their service.