Casinos with long standing campaigns in the forum also create their trust from there. And gamblers use these casinos to play their games more because they have more reliable and trust system. Most of the casinos that comes to the forum want to have traffic to their sites in a short time but it is not possible. Gamblers have to observe your dealings and doings for a long time before many would involve themselves in n the casino activities.
They can't just indulge themselves because you are doing well at the beginning.
Gamblers will find what reliable and trust casino so they will not get in trouble or errors. They will make sure the casino have a good support system and casino with long standing campaigns usually know how to treat their members better. Campaigns on the forum gets more traffic especially when they are success running the campaign from a long time.
Btw, don't forget to claim your free raffle and hope you will be one of the winners.