let the account be inactive cause the longer you wait the better the next offer might be.
 We can take conclusion those offer mostly came out due the inactive account
 
 
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.
Exactly, there is no guarantee that we will be offered a nice bonus once we become inactive for long time, as I have said some time ago, if it works like this then most players will start to be inactive to get nice offer and these players may repeat it again later once they make profit from the nice bonus. 
If it is really work like this, it wont be an effective marketing strategy for Stake as they will be just like sending free money for inactive players. 
Although there are some stories that support this speculation, it does not mean that it will happen to all inactive players because I believe Stake are not dumb LOL and there must be some other criteria in order to get the nice offer (not only being inactive). 
Just like the other bonuses in Stake, no one knows the formula, no one knows when bonuses will be sent because all are based on speculation/prediction. 
However Stake are not focused on wagering patterns only, our PnL statistic affect the bonus as well unlike years ago when the main factors were wager and vip level.