High roller bonuses are a special type of bonus that applies to VIP players who stake a huge amount of money on bets. Alternatively, a player can activate a high roller bonus by depositing a large sum of money into his or her account upon opening it.
VIP bonuses have the advantage of reduced wagering requirements in many of the casinos that offer such roulette bonuses. Players will have a better chance of activating such a bonus by meeting only a few milestones.
Casinos do this because they value their VIP gamers and would want them to continue gaming on their platform.