The 3.0 CSL was £6,400 to buy in 1972 (over 3 times the average salary back then) , that's around £100k in todays money so even at £50k it's gone down in value in real terms, plus the fact that it's probably had 10's of thousands spent on it. Not a great investment, when I paid £5,000 in 1973 for my first house which is now valued at £140k. The only way you can make money is if you figure out what is going to be a classic, get it delivered directly from the factory, stick it in an air conditioned garage and wait 30 or 40 years, better off investing in Bricks and Mortar or Art really
Very likely but completely irrelevant to me as I'm already 65 years old .
Pete