I totally believe in luck but i was highlighting "CHANCE" factor in all Promotions.
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The more you spent, there will be more chance of winning
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One person has almost NIL chance of winning compare to that person(s) who has dropped HUNDREDS/THOUSANDS of coupons in the same box.
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This is the reason why people don't stick to ONE BOND / SAVING CERTIFICATE. They will keep on buying as much they can to increase the "CHANCE" of winning