900-1500 Watt/hour to mine at 40Mhash/s?
I don't want to be a smartass, but I still I wanted to correct you on the Unit usage. Namely Watt/hour is not a meaningful unit that would describe anything useful. My guess is that you wanted to say 900-1500W to mine at 40Mh/s.
Indeed mining in those terms makes no sense at 900W will cost you at lease €2 per day where 40Mh/s will get you €0.2 per day. Now if the guy needs not paying for electricity, then it is technicaly still a profit of €0.2 each day