You've ever bought a guitar as a present for your spouse even though he or she has about as much talent as a milkshake.

To keep from having to retune your guitar, you have different guitars for DADGAD tuning and Open D tuning (DADF#AD).

By the way, rationally explaining the third guitar to the spouse is no problem. It's the tenth one that's tough. Fortunately, by the fifteenth one they will usually have just resigned themselves to their lot in life and won't even ask.

Bruce