This will change with the continuing revolution in data and the data driven decision making it makes possible. Eventually corporations that reward politics and personality will become weaker and those that reward data driven decision making will become stronger (except in cases where the corporation can depend on government handouts, e.g. Wall Street).
No matter what kind of business you run, the seller knows almost all the time more about the product/service/etc than the buyer. And as long as you don't have perfectly comparable products markets are far from ideal. Therefore the individual relationships between people matter because you can never fully quantify human relationships.