In many cases a customer walks into a shop and can't see what they
want and walks out without even asking about the item. With an online
shop your customer can see everything you can get for him and order
right away! He doesn't need to know you don't have it at hand right
now, all he cares is that he's going to get it soon and hopefully
slightly cheaper than from a street store. Plus if this customer is
not local to your shop, you have just made a new customer who would
not necessarily have been able to go directly to your bricks-and-
mortar shop.