A big part of this comes down to practice. Anyone who practices chitchat (or "persuasion") all day gets pretty good at it, at least in a narrow niche. Those "tech nerds" who spend a lot of time going to parties can also get good at it; however, many of the introverted tech nerds would rather be writing code or reading a book or whatever, and end up not practicing these skills starting from a young age, and by the time they reach adulthood are far behind. (In just the same way that someone who never spends time exercising ends up far behind in playing sports, or someone who never spends time solving technical problems ends up far behind in technical skill/expertise, etc.)

Beyond that, if the main goal incentivized is just to "make the sale", the methods used aren't going to necessarily ethical. There's a reason that pick-up artists, used car salesmen, carnival barkers, and social-climber middle managers use deception and burn people in the process of getting ahead: it works. If you have a system that selects for "what works" and doesn't negatively select away "causes collateral damage", then you end up (a) making ethical people play with a huge handicap, and (b) chasing them out of the field.