Just because that particular one makes 6cups of cooked rice certainly doesn’t mean that you have to cook that much each time.
Just adjust the water and rice to what you usually use.
Also, there’s a lot of other things you can make in a rice cooker.
If you want a great read at a cheap price written by a Pulitzer prize winner, get a copy of “The Pot And How To Use It” by Roger Ebert.
Yup, the movie guy. But he’s also a terrific writer and I love this book. It came out quite a while ago so Amazon has it for cheap.
Ebert describes all the different things he made in his rice cooker and how it encouraged him to healthier eating.
Get the book. You won’t regret it. I guarantee :)