Why would you want to support a new Alt coin, if you know people will only be hyping/pumping the price in the beginning and other people will be dumping it for BTC and Fiat? This will have a significant impact on your bank balance, when you allow trades during this "Pump" period.
Yes, you might get the advantage that new users will join your exchange, because you are the only exchange accepting Bcash trades, but those users will leave once they dumped their Bcash for cash or BTC.
If I were a exchange owner, I would just sit back and wait for other exchanges to take the knock and jump in later when the price is much lower. < Like Coinbase is doing >
It makes no sense to be a early adopter of a coin that are pumped to shit in the early days. ^hmmmmm^
The BTC price will also be less volatile with everyone buying & selling BCC/BCH and not buying & selling BTC.
Coin base investors ar already not happy with its decision of not supporting BCC.Some have even threatened that they would even sue against it for not giving them their free BCC.Kraken had also taken the same decision before.But now,Coin base has said that it would allow BCC trading in order to attract more customers who are willing to sell their BCC as they are not able to find any platforms or exchanges to sell BCC.Poloniex has already said that they would wait and watch and then decide.But till now,they have not announced any thing.