That's 10c per machine per day. I'd love to know what exactly a machine is doing to earn that. Bitcoin mining? Seems far too much for just that. Spam email? Seems VERY cheap considering how many thousands of emails you'd have to send from each machine. Ad-click fraud? Doesn't seem very much at all if that's that case.
Makes you wonder exactly where those estimates come from and who is actually supposed to be paying that amount of money for whatever service is rendered.