Sorry, but you are wrong. The price of a good is not a function of these. Price is a function of demand and supply. And demand and supply are in turn also a function of price.
For example, you cannot demand a salary based on the cost of your education. The market will decide what is the value of your labour.
Also, if you try to find a job in a saturated job market, you will understand the importance of "Sales". If you can't market yourself you wont find a job in a high-supply labor market however qualified you might be.
In a nutshell I think those who think Sales is "cruft" are the those who had it easy all their life, and who never had to compete with 100 guys half their skill.