I don't totally agree with him. The market governs the price of the vehicles, not the owners, if people want these vehicles then they have to pay the going rate, simple as that, I can't just stick a £10000 price tag on a rotten P6 and expect to get it, everybody would just laugh at me. The rise of ebay has given us a great way to gauge the value of vehicles, they sell for what people will pay for them, simple.
I think he needs to grow up a bit and realise that just because he wants to buy a classic for £50 doesn't mean he can ! And suggesting that a daily driven car should be worth more than a perfect garaged example is just stupid, if you want to buy a perfect example then you're going to have to pay a premium, or buy the daily driver and spend a fortune having it restored.
I do hate people that try to impose their ideas on others, if you want to buy one and store it in the garage, then that's up to you, if you want to drive the wheels off it then great I'd love to see it on the road, if you want to cut it up and make a hot rod, then great again, it's totally up to you, it's YOUR CAR !! If you don't like it, try bird watching instead !