It's a waste of energy

A gas BBQ is ideal for the small two person household, especially if you have a vegetarian as one of those people
(although surprisingly BBQ sausages seem to count as vegetarian under most circumstances)

Nice lightly BBQ steak for dinner, turn the BBQ up to heat clean for next time, go to bed, get up and find the BBQ just below the temperature of nuclear fussion. How much gas did that use ??