I had a laugh Dennis...... well um er um............heaps.
But we use it for more than just coffee, we use it to fill saucepans with Hot water, fill hot water bottles each night, Hot water for many other things as well. We wrapped or boiler which is 11litres with insulation and reduced the working pressure, this doesnt effect the Group head as it is the pump that does that work. I would say the unit works for 2-3 hours out of 24hrs and at .17c per KW I think it costs me about $1.50 a day. But the other option is to put it on a timer, but for us its a luxury that is valuable in many ways.
Go ahead and buy a commercial unit... the benefits are worth it in the long run.