I confirm that I have received my VIP upgrade. My new VIP rank on chillistakes.com is Inferno 1. Thanks, ChiliStakes.com and @ultraBTC for this VIP upgrade.
[I believe this casino offers bonuses like deposit bonuses in gradual release method which means you can unlock more of your bonuses the more you bet with increased VIP level.
All deposit bonuses are credited instantly (not gradually) to your account (at least that is what I have experienced with my deposit bonus). You need to add your deposit and bonus and then have to wager 35x (70x of your bonus) in order to cash out.
VIP upgradation helps you get more rakeback and other perks.