There seems to be a penchant, perhaps more prevalent in the USA than other countries, of keeping classic/collectible Mercedes-Benz cars in their "as delivered" state. This is when compared to other countries, and when compared to other marques such as Audi, Porsche and BMW.
There are very few shops/firms that modify MBs, but of those that do--Lorinser, Brabus and Kleeman, for example--most are not in the USA. Yes, I know about RennTech and Weisstech.
Compare that to those aforementioned marques: take a look in their club magazines (Quattro, Panorama and Roundel) and you'll see a large number of firms doing all kinds of modifications. You simply don't see it at that level for MB here in the USA. Porsche aficionados also have a name for the modified cars: "outlaw".
I think there is more respect for the kind of mods that Dr. Benz has done on his Pagoda and on 190SLs than say, that small block Ford V8 that was shoehorned into a Pagoda some years back and featured in The Star magazine (complete with aftermarket polished valve covers engraved with "Mercedes-Benz" on them...)
I think the long history of the Classic Center and factory support of many of their cars (this barely exists at other marques) may have something to do with it.
As for our charter, no, we don't mention "restomods". We also don't mention "modification". We do mention communications, restoration and preservation...but note we do have a forum topic on modifications and research.