Although the author did mention this in the article. I still wonder how much some of these indie games would benefit from partnering with a marketing consultant

Although the author did mention this in the article. I still wonder how much some of these indie games would benefit from partnering with a marketing consultant. Listing a game on steam is basically free marketing for the game. The author mentions only 1% of his sales are from direct sales. I wonder how much having an experienced marketing pro could improve that percentage.