Holy Canoly, some people can worry about the most arcane low probabilty events imaginable. I suppose if you live in a poorly insulated, drafty house in the northeast, a wooden shelf might flex enough in the course of a year to be discernible. Perhaps that might wear a few molecules of paper off unprotected covers. I've stored hundereds of lps for decades on wooden shelves three feet wide and I've never had the most miniscule of ill consequences.
