i wouldnt go as far as saying they are being lost as such . if you go to a specialist the chances are they will know a bit more about the car than say admiral or churchill etc .
it helps when you are talking to someone who who is as in to there cars as you are we beleive , with these sort of cars id be more enclined to say you are more likely to look after it as its as rare that would be refelcted in the premium