I've made only 2 quilts that were for "customers". There was no pleasing the first customer and I spent countless hours changing colors out, adding more batting, increasing the size with additional borders and in the end he balked at paying me even for the fabric. Several years later I again stupidly agreed to make a quilt for someone and frankly the joy in making a quilt was just taken out of it. I was paid generously, but had no fun in the making.
Now I just make baby quilts or lap quilts and give them away to pregnant coworkers or to the local fire/rescue squad and get to make what I want, when I want and using whatever color or pattern I want. I would never again make a quilt for a "customer".