Being at the VIP level has a different level of exclusiveness that it affords you. Just as VIPs in a real life club offers that and you know what, you also spend more. Spending more in casino when in the VIP programs means a higher chance of winning more but it does mean you have a better odds. Casinos do not mess with their VIP customers because they know that other casinos are waiting to receive them with incentives and they can easily transfer their VIP status to the other casino.