I am looking at offering my clients a shopping experience using Shopify. However it is going to be difficult to sell them on the 79.99 standard per month when they are just starting out. So how much do you enforce the .co.uk thing as I don't see how you can prevent me using your dns servers and me pointing to my shopify domain. Of course I don't know if it's possible or not. Is this limit just if you buy the name through Shopify?