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In my case, while the boosters are often on products I buy, they are often not on special the weeks I am boosted.I too find it strange. Ever since I've used the app I get the same points booster each week which is something I've always bought anyway, I can buy it multiple times a week and I still get the advertised bonus points.
I'm not complaining but I thought these reward schemes were to try and entice you to buy more and/or different products.