For me, both of them have a way of getting their returns. Since online price is usually less, they always collect delivery fee from the customers they are supplying the products to.

From my own to expect it the reason why I think is necessary sometimes to pay for the fees is that, I've seen someone who order something online, when it was delivered he rejected the product without a valid reason so most brand uses the delivery fee as a trust that this person is really wants to buy this product. Like you said shopping online is very easy and accessible you can do it on your own anytime anywhere.