I guess I am odd girl out as I have no idea why I would buy a pre-wound bobbin when I can buy empty bobbins, wind thread on, use up, re-wind again and keep doing this. What am I missing? Remember, I don't get out much and live in the country with one LQS within 45 minutes and JA's and WM 1 1/2 hours away. Fill me in, what am I missing here?