I have worked with an elderly lady (don't take this wrong, I'm 73 so I am elderly also) anyway she had gone through the depression so was very very thrifty and she brought it to be quilted. She had wavy borders, places where seams didn't meet and the backing was all pieced irregular. My friend and I fixed it and she was very very appreciative of the outcome. Since I don't do it as a business and her eyesight was not too good I did it as a labor of love..
I probably would not do that to someone who would or should learn the correct way to apply borders, which seams to be the most problematic.