Sometimes we get too hung up on what others are saying is "right". The first quilt I pieced was a king size Double Irish Chain - and a whole bedroom of accessories to match. I already knew how to sew, so I bought a pattern, went to JoAnn's, and bought fabric that looked and felt good for the project. I now would class that fabric as middle quality. That was almost 20 years ago, and that quilt is holding up beautifully, even being shared with 6 cats.
Do what feels right to you. Just remember that quilting should be enjoyed, not sweated over. If using expensive fabric makes you sweat, then buy what you can enjoy. I try to stay away from cheap quality fabric, but I rarely use expensive fabric. And I buy as much as I can on sale.