And whats more its a win win situation of everyone. The gambling sites wins as more people are referred to their site, The one promoting the sites also win the referral commissions and the End User (Gambler) too wins by actually playing at the site. In few cases, even if the gambler lose, he still have got the fun while playing the gambling.
How can it be a win-win solution right here? For the one who promoring their site may be they can get some bonus but for the gambler, I do not think they will be that good, since there are two types of gamblers, the one that play for profit and the one that play for fun. So we never know who is the one that play here, then it will never be a win-win solution for everyone here. Unless there is a guarantee bonus which can guarantee their players towards winning