Ghost written content is everywhere... from syndicated streams of hogwash to quality journalism, it still doesn't demonstrate your expertise.
My own experience, outsourcing our content to a quality FT journalist is similar. He was a financial journalist, but our product was the sub-set of a niche, and the content sounded clunky, glib and ill-informed to insiders.
We had a global audience of perhaps one or two thousand people - and that tiny, crucial group could tell the difference.
So we gave up, got back on the Boeing and did it all in person.
For one, content farms make it pretty easy for companies to tap into networks of freelance writers, programmed to produce and distribute content more concerned with SEO trickery/ wizardry than authentic storytelling. Results from using content farms are a mixed bag and prominent publications have been predicting their demise for the past few years.