For European sailings, I don't really believe
DCL is targeting Europeans. I think their target demographic is a traveler that likes the idea of visiting Europe but wants a very safe American retreat--surrounded by Americans speaking English--when they get back to the ship. Meinschiff, meanwhile, only appeals to a small % of Americans because there's a perception that the language and cultural barriers are too high, and you can see this by how little activity there is in the Aida/Meinschiff English message boards... most Americans would simply never consider those lines. And for the typical DCL cruiser, it's not an advantage if the ship is mostly filled with those speaking different languages or coming from different cultures. I have sailed with MSC several times, and the chief complaints from Americans mostly center around cultural differences.
So yes, DCL is for "wealthy" Americans, but that's the price DCL can charge to offer a safe retreat while allowing their American cruisers to dip a to into Europe without much effort. It's like a convenience fee.
I would argue that DCL, in their almost fanatical pursuit of premium margins, excludes a very large % of the total cruise market. Sometimes you need to offer multiple price points and target different segments of the market to create a pipeline for future cruisers, and I think it's very hard to get the average middle class European family into DCL for a first cruise with DCL's current price and itinerary offerings.
However, when the Adventure is launched, it's an entirely new ballgame. Because I don't think they intend to actively market the Adventure to Americans. They will basically be creating a new DCL ecosystem and market in southeast Asia. This will be very interesting to watch, because the pricing for the Adventure will almost certainly reflect the reality of a business that is growing from scratch rather than the Amerocentric DCL.