very seldom does a quilt sell at a craft fair---people wandering through a craft fair are not expecting (or prepared) to spend hundreds of dollars
items that sell well tend to be between $5 & $20
items like dishtowels with a quilted top (like the ones with crocheted tops for hanging)
potholders, placemats, mugrugs, fabric bowls, totes, purses...
there are many smaller items-
unless you have a good stash to work from it is hard to really make any money- unless you are really fast- and don't have to invest much in materials.
really check out your options when choosing craft venues to participate in- some you are lucky to make enough to pay for your space- others you may do quite well-