In order to build trust and await those who bet a large amount to come in, the more customers they will be able to make, the higher the profit they can expect from their losses at the end of the day.
Building trust in the casino business is important if they want to be successful. It takes time, money and integrity for casinos to build trust. Casinos need enough money to give out bonuses and pay wins promptly. The games should be fair and free from any form of manipulation. If a casino builds its customer base and is known for integrity, the business will profit. The biggest form of advertisement is referrals from satisfied customers. The gambling business is similar to other financial institutions like banks. Except gamblers are convinced that their funds are safe with a particular casino, they wouldn't stake high amount.