I would say that surely, the opposite of this is true.Oh I know the big expensive cars will cost more to look after, hasn't this sort of thing improved in recent years though?
I'd not be cautious at all about an E38 for example, something like a 740i from that era (ignoring the age of them, i am being hypothetical). They are fairly basic. Compare that with a high spec 740d F01 from the era being discussed and its in a different league of risk. Newer doesn't mean better built, but it does ultimately mean much more complex.