The price is right in the range. Many of my customers don't want to quilt the quilt, they like to make the tops. This is supposed to be a hobby for your wife. Let her decide what parts she wants to take on. If you're concerned about the cost, set up a budget for the year for LA quilting, and let her work within it. Maybe she'll decide to quilt small quilts herself and send the big ones out.
I quilted a King size quilt on my regular sewing machine....once. Never again!! Just be glad you're not married to me - I went out a bought a LA, then later the computer. My husband was informed AFTER I made the decision.