No idea why, but I am. I've never felt brand loyalty like it.
The coffee is beautiful. The cakes are lovely. The service is outstanding 99% of the time.
I often feel sad and lonely, and take myself to the nearest Costa. It helps.
Its nice just to sit and drink coffee and eat biscuits or cake in a coffee shop. I do this very rarely but when I do its lovely just to be able to relax away from the hustle and bustle of the internet and TV and normal routine.