Yes everybody has overhead. And they pass it on to the customers. Had you bothered to read the article you’d have seen them discuss the fact that 60 to 80% of what you pay goes straight to their overhead. so which part of that 20% they’re keeping is “too expensive”. I’ll tell you: none. Sorry you don’t like paying the price, but that’s you being too cheap not them being too expensive.
So no, I do not believe their overhead is up to 80% of their costs.