Looks interesting. Their website has some references to the ROI being short for cafes that go through a fair amount of coffee, but nowhere can I find them actually telling us how much it costs.
Under the heading 'The Savings', the site has:
So they're not telling.Return on investment (ROI) to a cafe using 1kg of coffee per day is only a few weeks. For high production cafes the ROI is only a few days. With domestic and office usage, whilst the overall coffee used is often not a lot compared to a cafe, the biggest savings is in time spent cleaning up the mess.