Why is it that 400-A's and 180 deluxe Phaetons seem to come up for sale more often than cabriolets? I just purchased a nicely restored 31 slant window cabriolet and have been watching several different sights looking for similar cars and I'm just not finding them. Are they that much rarer or do owners just tend to hang on to them? Just a curious observation. As for mine, I could not imagine ever parting with it.