"doing business without advertising is like winking at a girl in the dark.
you know what you are doing, but nobody else does."
First of all, the phrases are absolutely true in term of describing what is advertisement/commercial will function as. Watching the situation of small retailers serving good product or service, yet still unable to meet their targeted audience/customer, it's just the same situation with the boys winked at a girl in the dark. Some says, it's like you can make a good burger, yet you can't sell it because no one knows it's good.
Business and advertisement is like a gun and a bullet. Thus,a business without advertisement is like an empty gun, without bullet. True, it's still a weapon, yet it's no longer deadly to kill/reach your targets.
Hence, to reach your target audience, you need the so called 'magic bullet'. it's advertisement. Ads will make the audience notice and remember your product and resulting them to purchase the product.