The website builders which provide free services have some limitations. Like, when you just complete the registration of your store at any free website builder platform, URL of your store will be www.yourstore.websitebuilder.... This means, your store will run on a sub-domain. If you wish to run on your domain then one time nominal fee is there. This one time fee involves ecommerce store setup charge, maintenance charge, hosting charges and support charges. So, still it is a win-win situation for the ecommerce sellers.