I understand you're probably like most people on hacker news and don't care for people on the "sales end" of the spectrum, but he definitely didn't get rich selling advice.

He runs a really successful marketing company (https://vaynermedia.com/) a sports agency (http://vaynersports.com/), gives most of his content away for free on YouTube, wrote 4 books and is a NYT + Wall Street Journal Bestseller, and is pretty respected in the early stage Silicon Valley investment community (https://www.crunchbase.com/person/gary-vaynerchuk/investment...).

Like most things on hacker news, don't speak on something unless you know what you're talking about.