you have now sat in traffic for the whole day and still cannot find those Nike sneakers. What a waste of petrol money!! Shopping online eliminates the cost of a wasted journey. But also consider this, you can shop online in the best shops in London without having to buy an airline ticket.
Another reason to shop online, instead of in a traditional brick and mortar store, is a larger selection. Often a larger variety of colors, sizes, etc. are available online, than can be shown in a traditional retail store.