You could always plug it into a timer plug so it wasnt running the whole time. I never leave the dishwasher, washing machine or dryer on when I am not here so was concerned about the thought of a slow cooker going when not here. That was until a rep from one of the suppliers (I work at The Good Guys) told me that they use less power than your fridge which everyone leaves running without a second thought. I felt a bit silly after that haha.
DH + Me + DD (born 11/10/12) = our little family