Not sure the value prop for anyone to use Weebly over Shopify to sell something. Their admin is incredibly intuitive and they don't charge an additional commission if you use their payment system.
Like Dan said, we think that mixing a very intuitive CMS with a powerful eCommerce platform is really compelling.
We compare really well to Shopify on a feature basis, but have some other cool things, like secure checkout on your own domain, faceted search (e.g. http://www.dangshades.com/apps/search?q=polarized) and an amazing mobile checkout.
We actually do not charge an additional commission with our Business Plan, priced at $29/mo, and we integrate with Stripe, PayPal, Authorize, and others to come.
Making things as intuitive as possible is something we lose sleep over. Check out our demo video and let me know what you think.
Here are a few example sites:
http://2200pacific.everdwell.com http://465diamond.com/