I just checked shortly the Bitsler review and something caught my eyes "no bonuses or promotions".
I guess it's a mistake, since promotions are mentioned at VIP (although they are for everybody, really). One promotion has just ended https://bitcointalk.org/index.php?topic=1268718.msg31855864#msg31855864
Also they have their own forum with one section only for promotions (daily lottery and other games).