I used to go by pounds only because it was easier, but after my mom and I both tried Herbal Magic I started doing inches as well. Like you say, sometimes it's the only thing that keeps you going!
:)
I think for me sometimes inch loss is what keeps me going when my weight loss slows down lol.
I do pounds. I can't be bothered with inches. I would, if I was one of those people that never lost weight but lost inches. I think it's good for a lot of people but I'm lazy about it :)