Loyalty game and cash back

Woolworth has changed the vouchers to loyalty points. They have introduced a cash reward but never received anything. They have a game we play weekly but have never won anything substantial, instead we get voucher but only if you spend money at the store with certain products. I would like to know which ethnic groups wins. I have spent so much money at woolies, i am part of VIP but was never rewarded for anything. Woolworth will decline and start losing customers. They will end up being a supermarket selling only foods.