Having to pick outside of a line of fabrics opens my creativity. It can be difficult, yes, and I have shopped at a few different shops to find what I want. But just using all one line seems to make a quilt look too "commercial". OK, I have made a few quilt tops with just one line and they are gorgeous, but I am not as proud of them. They lack "me".
And yes, very expensive for an LQS to carry all of a series. And having to go to a few different shops gives me a chance to visit with some of my favorite shop owners and employees! Fabric shopping, shop hopping.. fun times!