Don't we all love the buying part.!! :-D I love the feel of fabric and the different textures!
However, I always tell beginning quilters to buy the best fabric they can afford especially if they are making something that will be around for a while.
When I'm making a quilt for a child whom I know will drag it all over kingdom come I usually use the less expensive fabric and save the good stuff for when that child is older and can appreciate the quilt.
Others on here may feel differently but these are my thoughts.