Without sales and marketing it doesn't matter how amazing your product is; if people don't know about it, they won't buy it.
One could argue that sales adds the most value to the process.
One could argue that sales adds the most value to the process.
In something like new auto sales, all of the information is available online and is usually more comprehensive and accurate than that offered by a car salesman. YouTube probably sells more cars than car salesmen these days (in terms of locating a product that meets your needs and convincing you to buy it)