hahaha, what is this? You guys forgot to add one crucial remark which is, 'up to an extent'  . I mean, no site is giving you free money for not being active for too long or only playing to exploit the bonuses. No matter what your VIP level is, it is just bad for the business. 
IMO stake focuses more on wagering patterns rather than the total wager of any player. Play more slots (or any other high-house-edge games) and receive more bonuses.