Quality fabric is so important when making quilts, I can believe anyone would purchase this poor quality fabric.
It would seem these stores would loose business by NOT selling this fabric. And either sell better quality or discontinue altogether. LQS fabric maybe higher priced, but can be purchased on sale.
We spend too much time making a quilt to buy poor quality fabric and have it fall apart when washed.
You can look at 2 quilts and tell immediately the quality of the fabric used.