I used to have a website but gave it up after a few years. It was too much work for me!
However, I found that by the end, I was including shipping for within the U.S. and Canada. My sales within Canada were limited enough that I just ate the GST and paid it out myself. I did charge for international shipping however. The reason I did this is because of impulse buyers who will buy something but if they wrote for a ship quote, they sometimes changed their minds. I just added an average shipping cost to the purchase price -- won on some, lost on others... The lightweight things that sold to Asia or Europe I usually included the shipping costs as well. It was only the really large or heavy things, like coats and Victorian dresses that I charged international shipping on, and of course I gave them a break because there was already a $10.00 or $15.00 shipping charge imbedded in the purchase price, so they were happy too to have a shipping cost of $10 or $20 instead of the actual $25 or $35.00 charge.
However, I still found that having my own website was too feast and famine to make it worth my while and gave it up, so what do I know!