OTOH you occasionally get a really good customer. I once was asked to make a Tumbling Blocks quilt from a picture in a book, of a vintage quilt, all in solids. We figured there were about 30 different colors to buy. We gave the buyer a price for the quilt, and told him, you can get the fabric, or for an extra $200, we will get the fabric. (This was 25 years ago)He said go ahead.
And when we delivered it, he paid in CASH from a big roll of bills!! Wish I had more customers like that!!