What does it take to make a lucrative career from selling stock on Envato, specifically VideoHive?

I’d like to know what sort of operations, companies like PixFlow, PremiumMilk etc are running.

Is it one or two people tirelessly animating all day or is it a team of 20 with an intense workflow that starts in a boardroom going from idea to concept to approval to research to design to animation and then sales?

What am I getting myself into, if I am to sell big? I’m almost as good as the top tier sellers.

I once read an article about the top sellers on themeforest and they make millions of dollars and are a team of only 3 people… So if there any articles, please send, if you are one of the top sellers, please advise.