think I'd laugh this off--say "thanks for liking the quilt, but it's darn near impossible to enlarge a quilt and wayyy beyond my 'pay grade'!" then add, something about not doing quilts on commission as the cost of making quilts is so high that adding in reasonable labor costs, that most people shy away from being willing to pay for them. that sets the stage that no large quilt is coming their way without a nice big check (make that two, an initial one to pay for materials, a 2nd one for completion). My guess if you make it obvious that it will take some $$ to get another quilt, they will back off.