They can not resist what you put in front of them

Temptation is money maker. The more temptation you place in the path of your customer the more likely they are to purchase. ChangingMinds has a article on "restraint bias"

The bottom line is a warning: 'Restraint bias' is real. The more we believe we can control our urges, the more risks we take and the more we end up giving in to pressures from the subconscious. If you want to say 'No' to yourself, realise the danger and keep yourself out of temptation's way.