I am with you Peter,
Whilst I am the custodian of my 230SL, I would like the prices to be stable so that the cost of keeping it remains within reason. Have a look at the cost of 300sl parts and you will see that unless you are extremely wealthy you could not afford to have any problems with one.
But as you said value increase also justifies to the Minister of Finance that it is a worthwhile investment. Damed if they do rise, damed if they don't.
Garry