Not should, could. Most people get paid weekly/biweekly, meaning they could plan to not spend $15 on one thing to get another you wanted
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So what you are doing is placing your chosen $17.50 to $20 ABOVE other things of equal or lesser or greater value that a person/customer might desire to purchase. This is a flawed argument. You only see this as legitimate because of your bias towards THIS particular $20 purchase.
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I do this almost every week? If I want to buy a game, I won't spend as much on food or buy food and make stuff at home.