[greglepore]

E320's in particular, as you probably know, are subject to external head gasket leaks which folks let go as it just is an oil drip, until it isn't, and then it becomes a 4k repair.
More generally, the cars that are good enough to have survived the crossover point between low purchase price/high repair cost are now desirable/collectable, and the ones that weren't that good for mileage or upkeep reasons are gone, dead, c'est mort.
I really want a driver e28 but they're suffering from the same dynamic. Glad I got my 2 v12 MB's before they started to escalate.