Those are very good questions, Holice.
I have had several people hire me to put on their bindings, and they seem to fall into one of two camps:
1. Some quilters seem to have a fear of binding for reasons they don't seem to understand and can't explain to me. They are just terrified of binding, they dread it, and it's a relief to have someone like me who they can pay to bind their quilt.
2. They don't feel they have the skills to do good bindings. They don't know how to sew the strips together. They don't know how to do mitered corners. They don't know how to hand sew, or how to tie a knot, or how to hide the ends of the thread. And along with not having the skills is not having the patience.