mine are only around the 100 mark, with just me and my brother
mainly two computers on 24/7 and a lcd.
gas hot water and stove for the win

mate at work had his elec booster on 24/7 for hot water and his bill came in at 600+
he tested how much power this was using and turned everything off in his house and looked at the meter, the booster nearly tripled the power consumption over everything else