They should update the [FAQs]
Why do I need to place my products in fiat?
Because of the fluctuations in some virtual currency this is the most viable and safe option. When the products are placed in fiat you won’t have to worry for any virtual currency fluctuations.
EDIT: Why is “TAX number” compulsory in the checkout process, with a guest account?
EDIT2 : Is someone keeping a list of shops that accept NuBits? They deserve a space on the website I believe