I dont understand mothers - mine used to say some hateful things and never thought twice about it. When I finally got to be 40 it got better, and now shes gone and I miss her, but boy I remember the bad stuff.
I fold over my back alot cus I too do not have the money for a lot of nice bindings. I use my quilts and where they go theyre used too. The only worry might be that being the outside edge it might wear faster. Maybe if you plan a bit ahead when you get to the binding you'll have left enough to double it over before you sew it down.
My mominlaw who is an exceptional sewing person and quilter also doubles over the backer for a binding edge at times. share t