How many brands could just cut out the traditional or sales-based advertising and go for quality and word of mouth growth like ANKER? Nothing sells me on a pro

How many brands could just cut out the traditional or sales-based advertising and go for quality and word of mouth growth like ANKER? Nothing sells me on a product like a happy customer. I scroll past the adds and related items on sites and dive right for the comments. Or just ask around work for what people use for X.