The American market and European market are vastly, vastly different. To say Americans don't care is not accurate. More accurate is that Americans have grown up with these cars and seen these cars over many years and so they don't register all that much. Pretty typical response to something that is in abundance that one takes it for granted. Then there is the fact that how we perceive the price of gas to how they do is also vastly different. No one here wants to pay $3 a gallon and is conditioned to that while over there they are conditioned to have always paid much more. Demographically people under 40 could pretty much care less while over there they see things differently which has been the case for a long time.
On the other hand the average European had to be satisfied with smaller cars with their typically small engines. To get a V8 or V12 one needed to spend some very serious coin on a European car that was out of reach for most. However, the desire to have a big V8 car would seem to be universal and with steadily improving economies, over the last 30 years, Europeans can now get their desire fulfilled. When I was there in 1976 most of the cars I saw in Sweden happen to have been left there by Americans. Almost none imported like today. One can still see many American cars around the old Clark Air Base in the Philippines to this day. Airmen headed home and sold their car before leaving. Many US bases in Western Europe back in the 60's and 70's.
So to say that they are more discriminating in their taste isn't it. With the increased value of the Euro over time many can now indulge in a long pent up desire. That is driving a big V8 car and cost be damned. What better representative is there than an American full size? Those guys like cars as much as us and can now expand their range. Just read some of the stuff that the fellow who does Curbside Classics. He moved over here from Austria around 10 or so, in the 60's, and was just fascinated by all the big American cars. He was always disappointed when his father bought a frugal smaller car. Plus they haven't forgotten their roots as I had a friend who imported older Porsches, BMWs, and Mercedes back to Europe because all theirs from the 70's were pretty much gone from the roads.