Because that's not what they're interested in! Really what they care about is that the fridge is consuming about 9.36 MJ/day, because really kWh is just a conve

Because that's not what they're interested in! Really what they care about is that the fridge is consuming about 9.36 MJ/day, because really kWh is just a convenience unit for joules. But since everyone gets charged in kWh that's the unit they use.