Then the claim above can never be falsified because there will always be a value you can plug into the equation at which it's cheaper to rent (like at 50% occupancy, at 5%, at 0.5%... so long as you're not the only person in the world who wants to use the device being offered for loan). I would assume we're talking about a common workload where one actually needs the device that one considers purchasing for some reasonable fraction of the time and not less than half the time