I think a lot depends on how attractive the quilt is, and also on the size of the quilt.
I don't see any point in making a tied quilt that sells for less than $50, or a bed sized quilt that sells for less than $100.
Your biggest problem will probably be finding a market outlet. Some people are able to sell quilts just by hanging them in the front yard and putting out a sign (please don't hang quilts in sunlight, though -- very damaging to the colors). This works best in Amish country, but can work elsewhere also. Many people simply don't understand hand-made quilts.