At the rate I hand sew - I would earn about $0.50 an hour if I only charged $0.25 per foot
I think the better question to ask YOURSELF is: (and others have said basically the same thing)
What do YOU need to charge to make it worth the effort?
If someone wants it done badly enough, they'll come up with the money.
Sort of like going to a doctor or a lawyer or mechanic or plumber-
One can shop around and get references - but the bottom line is -
One pays what they charge!
Or one goes without.