Doubt any big gold buyers | sellers run gold farming business.
Most of them just buy gold from Stakers that just simply look to dump their gold to profit.
When it comes to selling gold, there is a lot of people who have staking addictions and buy gold to continue staking and they don't really care, they tend to buy gold to profit from staking and sell back i guess.
Also there is the people who just don't wanna grind for the money and purchase gold to simply enjoy the game and have fun.
The answer to your question is: Yes gold merchers make a lot of money.