It is not just the mileage
Rubber seals, gaskets, tyres/tires, filters, brakes... there are all sorts of consumables that need to be replaced on a fairly regular basis even if a vehicle is not used very often so unfortunately there are no guarantees (I have never changed a set of brakes at the "required" service interval - time or distance - but then I know what I am looking for. I doubt most people these days even know what the brakes look like except as a shiny disk through the holes in their alloys...)