My favorite LQS does have a corner for the little ones to play...... I don't have little ones anymore but I love to see them happy playing while mamma shops.
Also, having a place to display customer's finished quilts is wonderful. Quilters love to have others see their work and who else can appreciate the work that goes into a quilt?
Having a day or evening for open quilting for a small fee ($5 is what our LQS charges) allows quilters to gather and meet others that share their hobby. People coming in the shop get to see what others are working on as well..... gets them in the mood to buy fabric and get started on something they've seen.