This is especially true with luxury brands like Louis Vuitton, Gucci, and Prada. People are either trying to impress others with fakes, or they’ve actually paid full price to become walking billboards.
Similar thing with iPhone cases that have a cutout for the Apple logo. That’s just hilarious.
A sports piece of clothing or equipment is functional with or without the flashy branding; a piece of merch however is not (especially if it’s just decorative - like a pin, a sew-on patch or something like that).