Why would someone pay $500 for a simple shirt like this?

Why would someone pay $500 for a simple shirt like this?
Black tee with the word GIVENCHY (designer brand) in the middle front. A lot of designers make shirts like these, with simply the logo and no creativity, so there has to a demographic of people that are complacent with spending hundreds of dollars on them. But why? The "design" is worth like $20, anyone can make a custom shirt like this.
Why would someone pay $500 for a simple shirt like this?
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