This sounds like a viable opportunity, but I agree that you should charge more than $10 per hour for this type of work. This is repetitive action and you can end up doing your hand joints a disservice by working them too much. It's true that quilters in the past spent many hours every day hand piecing, hand quilting, and hand sewing on bindings but these tasks all require slightly different hand motions. Spending the same amount of time sewing on bindings only makes the actions more repetitive. Also, we tend to live longer than quilters of the past, which means there is more time for joint wear-and-tear to show up. Five hours a week isn't so bad, but if you are looking to double or triple that number of hours, you absolutely need to charge more to compensate you for the risk of joint damage (or carpal tunnel syndrome, which is more reversible if caught early but can still involve doctor visits).