Duelbits is fast to react whenever there is an accusation, they immediately solve it if something arises.
Their customer support is 10 points, very professional. They can miss it but if community informed them by their representative in bitcointalk, they quickly response and handle cases.
This is one of the reason why cases against Duelbits do not pile up. Most of them are solved or clarified within one or two days.
Pile up or not, a matter is they handle cases very accurately. Less likely they make mistakes and if mistakes are found, they correct mistakes quickly.
Besides, I believe they clearly state the reason why a certain player is being punished or blocked. And if ever the fault is on the casinos end, they immediately fix and solve the problem.
Better to handle cases accurately initially than make mistakes and have to handle accusations. It is not good for a casino and Duelbits team actually do their job well in investigating suspicious users as well as handling these cases carefully and accurately. They actually don't want any valid accusation against their decision on users.