In certain types of company, it's workers without management responsibilities who do the work that brings in the money.
Think of a delivery company, for example, where drivers make deliveries, which is what the company gets paid for. Too many managers - AKA too few employees per manager - will sink the company, because managers draw a salary but don't make deliveries.
Of course, this analysis might not work as well for a company like Google. I'm pretty sure I can publish an ad without any human intervention on Google's end, so maybe they have no equivalent to the drivers, making the ratio incalculable.