Okay. Here's a specific example. My 4x4 TravelAll cost $1200, fully running and operational, and the most expensive part on it to replace is tires. While still in use, it would do everything I could possibly want it to do, on or off-road, and anything it's too big for, I have a Scout to handle, which is even less expensive to maintain. In terms of practicality, my 4x4 Eddie Bauer Ranger costs very little yearly to maintain, and meets my needs exceptionally well. For larger stuff, there's our Centurion Classic C350 4x4, which may or may not be less expensive than a 'mog to maintain now that it has a Powerstroke upgrade, and for the really big stuff the M923 is right here. But I'm not about to claim that one is anything other than an absolute beast for support costs.
I've never seen a Unimog, of any kind, sell for less than about ten grand in similar operational condition around here, and if I'm understanding current trends, they are rising in value. From what I've seen on various forums about these trucks, the parts can start adding up quickly even for basic maintenance stuff. Especially with import costs rising. My personal dealings with the Mercedes Benz dealers have been less than stellar, they like to gouge around here. Of course, this is my experience with every dealer I've been to, of any brand, so this is not a shock.
Now, maybe I'm wrong and things have changed in the not too distant past and costs have dropped significantly for Mercedes Benz parts, but that isn't my direct experience. I would be delighted if this were the case, and happy to admit that I am mistaken. However, I have not personally witnessed this.