because we aren't talking about candy here. we are talking about purchases that are hundreds or thousands of dollars. and people are normalizing making these purchases yearly. sure if you're dumb and rich go ahead buy what you want. but the culture pushes this mindset on people who cant afford it as well.
unless you have the money to blow, then having critical thinking is an important skill. to ask yourself "is this a waste of money?", "should I really be buying one of these every year?"