With the input of many users I think it is clear that it is a scam because most ppl confermed it that higher you will go the lower the btc reward will be and also most boxes will be empty. And if they are paying sites why don't they lower the withdrawal amount to 0.001 as anyone with lvl1 can achieve it with opening just a few boxes.
THE SITE IS A SCAM AND DONT WASTE YOUR TIME ON SUCH SITE THAT YOU WILL REGRET IT IN LATER ON
Exactly what I have been thinking from day one.
As you reach a higher percentage, the points you keep receiving keep lowering in away that by the time one reaches above 80%, it will look virtually impossible to reach the withdrawal limit and with this people will give up before reaching there.
So basically it's will be time wasted on the player's side and maybe ad views gained from their side.