If you're thinking of starting this as a business, then you need to start thinking as a business person.
Thinking that 15 cents a foot seems to high and a dime is better is not business. Consider how long it takes you to do the job? How many inches can you do in an hour? etc.
The hand quilter I use charges a flat fee.
The LAQs in this area all charge per inch.
And these are with the binding ready provided as ready to go by the owner of the quilt.
If they make the binding or do any extra work, such as trimming, pressing, it's totally by the hour.
I had my first quilts bound for me as I was excited and wanted to get them home and onto my bed!! I soon decided for the $$ I could do the job myself, and I now have no qualms in doing binding.