it varies by location too, some areas you can find really inexpensive beautiful quilting and some locations you can find very mediocre quilting for alot.
the first quilt i paid to have quilted was HUGE! as in really big! large KING the quilting job is really really wonderful! it is beautiful; when i went to pick up the quilt and saw the bill at ($385) i about fell through the floor. when he said .025 per square inch that really did not mean alot to me i guess...
i try to be reasonable for my area and i also keep in mind my main customer base and what they can afford, the kind of quilts they make. lots of long-armers charge by the square inch and offer alot of 'services'
i have one lady who took a quilt to someone for quilting and asked what it would cost to have the binding attached too...$125 was the answere! i am assuming this long=armer hates doing bindings, or really doesn't have time.