So why is it cheaper? Maybe because there is no need to rent a place to display the products in an area where there are lots of people. The number of people will also be less. And they can just use the services of another delivery company to do the delivery of the items. I am pretty sure they also have a number of barcode scanners because handling items electronically is way, way more efficient when it comes to inventory and billing.
And there is this thing called Rückgaberecht, which is the right of the customer to return a product item without any questions within fourteen days from the date of arrival to your doorstep. It is the law and is applicable not only for shopping items but also for contracts, for example a mobile phone plan. This is so that you can return the product if it does not fit, or you don't like the color, or you just simply changed your mind.
Now, ain't shopping easier this way?