That is a good question...I think we mainly buy them to work on and look forward to our next small improvement so we can discuss it on these forums...
Lots of reasons to own one... but performance is way down the list for an old Benz dieselhead....I think it is just the whole car that is interesting....kind of like ownership of working antique machines and curiosities....The multi-fuel aspect of the IDI diesels is always fun too....Because they will run on many liquid fuels, do not need computers or OBDII systems....These autos may come in handy in a pinch....

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)