Is it possible that at the LQS if you say you belong to "such and such guild" they give you a discount for the fabrics for the charity quilt? Or they have kits made up for a certain pattern for the guild to use as a charity quilt? Or have scraps bagged up for you to use? This would be the only reason for going to a specific place.
My guild has a LQS owner in it, and she has had offerings to the guild at times.
Otherwise, I'm like the others. I don't like being told how much to spend to give to charity.