You were running the campaign in the bounties section. That's why you didn't receive a good engagement from the actual gamblers. You could have run the signature campaign in the services section (payment in BTC) for a longer period to get a better result.

You have shown a good manner to make the above user satisfied. But you should take care of the deposits and withdrawals properly. The deposits should be credited automatically after a required number of confirmations. And the withdrawal should be processed instantly (within 1 hour) to keep the gamblers satisfied. But the message on your withdrawal page will discourage the user to make deposits in your casino.