I hold both XRP and CSC so I'll try and answer your questions as best I can.
CSC can be traded on 5 exchanges currently:
Yes, volume is low at the moment, Bitrue gets the most volume and usually on the XRP pair.
Technically casinos could use the XRPL, however they are at the mercy of any limitations and whatever upgrades/changes are made to XRPL. Because CSC ledger is created FOR the gaming/gambling industry and is developed by a specialised team, they can upgrade and add features whenever they like. If a casino wants the CSC ledger to address a specific task for them then the CasinoCoin Foundation can implement that custom feature specifically for them, in fact 3rd party tokens were issued by CasinoCoin because it was requested, companies approached CasinoCoin Foundation and asked them to create custom tokens for their purposes.Because of this, Cammegh Gaming, the biggest roulette wheel manufacturer in the world will be using CSC ledger to record data from their wheels using their custom 'Cammo' token.
The CasinoCoin Foundation and board of advisors are all experienced and well connected within the gambling industry, in a similar way to Ripple employing ex SWIFT/HSBC/FED staff.
If you have any further questions then feel free to tag me in this thread and I'll do my best to answer them.