How do online shopping websites make profit?

They sell their products for more than what they purchased it for.

Plus they do not need to pay rentals. That's why their prices are much cheaper compared with those same kind of products. Therefore, sometimes, shopping online can be super convenient and cost-efficient. But you should keep your eyes wide open in case you get tricked by swarthy merchants. Try to order from well-deserved reputation stores online. Here I know one for sure that they have got plenty of fancy quality dresses, as persundresses.com. They have a full refund policy if anything happens to the products during delivery. They also offer free worldwide shipping. Of course, if you want to have your dresses earlier, you can pay to get faster delivery. :)