...caravan hitch covers?" My wife asked on holiday?
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"For the same reason they buy HiFi ephemera" - I replied. "Somebody sells it, and they like to buy affordable accessories for their hobby."
Consider the hitch cover. It stops the hitch getting grubby when parked. But it is not significantly easier to clean than the hitch itself, and it does nothing for a hitch attached to a back of a car being dragged through all manner of old sh*t when towed to the South of France, as I well know.
No - the real reason is to stop you getting grease from the hitch on your trousers when accessing the front locker for gas bottles and the like. Except that more than 15 years ago now, all hitches changed to dry hitches integrated with a stabiliser device which operates by pressing friction pads against a BONE DRY tow hitch.
And yet you see any number of these, particularly at "club" or "rally" sites - all on new vans with bone dry hitches. Perhaps they are to stop grease from your trousers contaminating the hitch?
I wonder whether cable lifters, and other "as yet scientifically unsupported" HiFi products have a similar role? Just a thought