Same reason why kids have paid for Transformers merch, Star Wars merch, band merch, etc.
It's a brand, they like it, they want to be reminded of it and show their love of it off. It creates an "in group" which is socially valuable. Streamers are nothing special in that regard.
It's a brand, they like it, they want to be reminded of it and show their love of it off. It creates an "in group" which is socially valuable. Streamers are nothing special in that regard.