Comment by tormeh

The blanket statement "Advertisement does not work", which I really hope is a strawman, is trivially wrong. If you start a new B2C business the only way to do inbound sales is advertisement, as by definition no one knows about your company/brand/products/services. Outbound sales is (usually) impossible in B2C for cost reasons. Almost every successful B2C company is evidence that advertisement works. There are some exceptions like banking and utilities, where the LTV of a retail customer is high enough to do outbound sales, but most B2C companies can't afford this.