Adam; remember cars & coaches are worth what people deem it necessary to pay to 'connect' to them. There are $3000 '57 Chevy's and then $155,000 Chevy 'Fuel Injection' Bel Air Convertibles. Sitting at home in the armchair; The Mecum, RM & Barrett Jackson Auctions have proven that. Restorations can vary from $10,000 to hundred's of thousands of dollars. Ultimately- you get what you pay for.
The respect ratio on these old Hearses and Ambulances are based on the fact that they were literally custom made back then for the individual Funeral Director- who's to say how much they are worth? today! Relish in the fact that your Ford is riding on the coat tails