Have you ever gone to buy something online, and once you see the shipping price decide not to buy it anymore? Are you more likely to search for a product offered on a website with free shipping site wide, rather than a website not offering free shipping site wide?
i personally do a lot of online shopping just because i think its quicker and easier. i usually tend to find items with free shipping or i come across certain deals where if you spend a certain amount then they will include free shipping. if i want to purchase an item and the shipping charge is a ridiculous amount, then yes i will try to find another site where i can get it cheaper but if i feel the product id of less quality then ill go ahead and pay for the shipping.