Why do people buy things they don't need?

Right now people are buying the hello kitty blankets and reselling them at an even higher amount. I find it to be greedy that people buy in bulk to just resell them knowing it's what people are wanting. I know that it's their money and they can buy what they want, I just find living a minimalist life is way better than over consumption. I have what I need and only buy what I truly want. I don't have excess amount of beauty products or make up.

Why do people buy things they don't need?
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