Maybe its something to do with the vehicles that are for sale
It is I would suggest a very niche market within a niche market
People will have a Jeep or a Dodge or a Land Rover because they are easy to drive, maintain, store etc etc
A DROPS and a Saladin are big, complex and not easy to store (thats before you get into the driving licence, taxation class discussions)
And maybe do not inspire peoples imagination as other vehicles do, lets face it DROPS are still I believe in service