What is the cost of listing a new coin on your exchange?
You can find out about the cost of listing and possible trading pairs on this page
https://eurekax.io/addcoin Wow! 0.7 BTC for three trading pairs?
In my opinion, this is too high a price. What is the daily trading volume on your exchange?
Many exchanges charge millions of dollars for listing one trading pair. I think this is an acceptable price for an average exchange in terms of trading volume.