Kathy, where I live, Professional long arm quilters charge by the square inch. Last year it was 2 cents per square inch. Did she tell you she was going to charge in this manner?
I also know someone in Missouri who does beautiful hand quilting, and while you have to mail it, I don't think it would cost that much. If you are going to continue making quilts, you might want to look around for someone else who can quote you a better price.
I certainly would not laugh at you, but do feel some sympathy because the one person who does long arm quilting at a reasonable price is not very good. This has caused me to consider that I need to quit giving my money away and invest in quilting equipment to do my own. I have made a dozen tops in the past 10 months. I might slow down a bit if I do the quilting. Paying for these services can take the fun out of quilting.
I hope you do not give up on this wonderful hobby.
June