Master Bates (you wouldn't be from the dark blue, by any chance?): this is something that has given me some thought over the years. After some 14 years in the Navy, where we flew true all the time (not too many nav aids out there...) it almost hurts to sit in a modern airliner with triple IRS and double GPS and see everything being converted BACK to magnetic, just to fly direct-tos most of the time!
GA is a different matter: money counts.