Gambling sites have different promotions to attract players to use and play on their sites. Most of them give out free coins when you register, giveaways, challenges, competitions and a lot more. I think other gamblers are also looking for site that are generous when it comes to this kind of promotion.
Its really true, so that they convince people, therefore they offer some prices and items that you will get. Introducing gambling sites and to promote are also an ordinary way that people may know if what kind of sites. But if the gamblers are not contented on that site they can search other gambling that are beneficial.