you're missing the point. headphones were made to sound good, not to be an accessory.
And t-shirts were made to clothe you and keep you warm, not to be an accessory. The thing is, anything and everything is 'an accessory.' Cars are meant to transport you from place A to B, but nobody complains that Ferraris exist as status symbols. Sunglasses shield your eyes, but rich people wear Louis Vuitton shades to show off their money. Watches are supposed to tell you the time, but ROLEX exists. Phones simply send and receive communications, but someone with an iPhone 5s or a Galaxy S III gets more attention than someone still sporting their Motorola RAZR.
Literally everything has luxury and economy versions. Luxury isn't always better than economy, but people care more about the cost than the quality.