But my point is that doing that analysis is pointless, because the dollar amount is so low. The difference in price will never be more than a rounding error in a company's expenses, so it's not worth worrying about.
If someone at the company wants it, price point shouldn't be what's keeping the company from using it.
In my experience, if a tool provides any business value at all, worrying about $6/employee is a complete waste of time. If Slack saves each employee 6 minutes per month then it has paid for itself.
Developer tools generally charge far too little for their offerings - price point is probably not even a consideration for most companies, as long as its within an acceptable band.
If someone at the company wants it, price point shouldn't be what's keeping the company from using it.