I have washed a quilt and had a seam come apart on me (only a couple of times over the years, but it does happen). Would rather have it happen at my house, than someone elses. Also I have worked on some quilts for months (things like life come up, you just never know), they will pick up dust or someone came into my studio and touched my quilt. Then I will find some kind of print or mark that needs to be removed. I feel better knowing I am giving something that is clean (I even wash things I'm giving to GoodWill).