Thankfully my wife and I are equals....married 42 years and have always decided on big purchases together, we both quilt and buy what we like. I bought some nice fabric that was $14.99 a yard but, had 50% off coupons. I kept going back using coupons until I had 3 yards of each of the 8 fabrics in the collection. We never pay full price but, would if it was something we needed or wanted badly enough. Lately she has bought far more fabric than I have but it doesn't matter, she likes it and will use it as she sees fit , when she sees fit.
We also buy lots of backing from BacksideFabrics.com as we have never gotten anything but NICE fabric from them...Lots of times we find a 108 inch width piece for as little as $10.90 a yard...so we buy 1 and 1/6 yards and get 3 full yards of fabric for less than $13. It's nice to be able to enjoy a hobby together that we both love and spending time together as well. Together we probably have far more fabric than we will ever use in our lives.